IMPRO METALURJI
Impro Metallurgy is a progressive non-ferrous casting foundry speciliazed in high conductivity copper castings. Although the company newly established, owing to matchless experience gained different companies since 1998, impro became one of few foundries that can manufacture difficult castings ....
Address:S.Orhan Mah. Haskoy Dokumculer San. Sits., 13/A Blok No:3 Gebze, Other, Turkey
Product/Service:copper spare part, electrolytic copper, copper box, copper panel, electrode holder, electrode clamp, contact plate,,copper spare part, electrolytic copper, copper box, copper panel, electrode holder, electrode clamp, contact plate,
Dalian Reddy Machinery Co.,Ltd.
Dalian Reddy Machinery Co., ltd., founded in 2010 late autumn, located the beautiful coastal city of dalian, we focus on using machining center production mold, mechanical parts and electrode, have new machine, infinite passion from 15 years experienced technician. We not only need a business, more ....
Address:No.34 Haerbin Road,Economic&Technical Development Zone Dalian Liaoning 116600 China
Product/Service:copper electrode, graphite electrode, mold, mould, Mechanical Component,copper electrode, graphite electrode, mold, mould, Mechanical Component
Shanghai XINEN MATERIAL Co.,LTD. EDM Supplies Factory
www.ChinaEdmTube.com We are the Leading EDM Tube and Wire provider in China. (Copper Electrode) is produced by Shanghai Xinen Supply Factory. EDM Electrode)is applicable to high -speed electric-spark small-hole processing machines, especially for deep small holes, high-speed processing. ....
Address:RM 303 No 3 Business Building 50 GUO QIN ROAD Shanghai 200070 China
Product/Service:EDM TUBES, EDM WIRE, PROBE, Copper Electrode, Tubing,EDM TUBES, EDM WIRE, PROBE, Copper Electrode, Tubing
Changshu Minghui Welding Equipment & Material Co., Ltd.
Changshu Minghui Welding Equipment & Material Co., Ltd. is a professional factory for welding alloy. It has history of more than 26 years. The main products are as follows: CuCrZr, CuCr, CuZr, BeNiCu and CuNi2SiCr. Their specifications can be rod, disc, flat, bar. Electrode Cap also one our its material ....
Address:Yaozhen Village,Zhitang Town
Product/Service:Electrode Alloy Material,Electrode Alloy Material,CuCrZr(C18150) material,CuCr(C18200) material,CuZr(C15000) material,CuBeNi(C17510) material,CuNi2SiCr(C18000) material,Copper Rods,Welding Disks,Copper Alloy Billet,Copper alloy flat,Electrode Cones And Electrode Caps,Electrode Holders,Welding Guns,Welding Machine Parts,Welding Fixtures For Car Bodies,,,,Electrode Alloy Material,Electrode Alloy Material,CuCrZr(C18150) material,CuCr(C18200) material,CuZr(C15000) material,CuBeNi(C17510) material,CuNi2SiCr(C18000) material,Copper Rods,Welding Disks,Copper Alloy Billet,Copper alloy flat,Electrode Cones And Electrode Caps,Electrode Holders,Welding Guns,Welding Machine Parts,Welding Fixtures For Car Bodies,,,
IS (INTELLECTUAL SOURCE) ASIA PTE. LTD.
IS (intellectual source) Asia Pte Ltd. Our company is a professional machine trading located in Singapore with over 10 years experience service. It also has subsidiary Fujian, Xiamen, P. China R. China. We are expert distributing, servicing high quality and accessories. Now we had established good ....
Address:BLK 9# 05-06 Kallang Place
Product/Service:EDM Machine,Used machine,Tungsten Copper,Erowa Chuck,Brass Copper Tube,Led Products,Solar System,Machine,CNC Superdrill Machine,CNC Wirecut Machine,CNC EDM Machine,Used Machine,CNC EDM Machine,Material,Copper Tungsten,Graphite Electrode,Jig Fixture,Used Erowa Fixture,EDM Electrode,Copper Tube,Brass Tube,Molybdenum Wire,Copper Tungsten Obit Tap,Copper Obit Tap,Copper Standard Tap,Accessories,Cerami,EDM Machine,Used machine,Tungsten Copper,Erowa Chuck,Brass Copper Tube,Led Products,Solar System,Machine,CNC Superdrill Machine,CNC Wirecut Machine,CNC EDM Machine,Used Machine,CNC EDM Machine,Material,Copper Tungsten,Graphite Electrode,Jig Fixture,Used Erowa Fixture,EDM Electrode,Copper Tube,Brass Tube,Molybdenum Wire,Copper Tungsten Obit Tap,Copper Obit Tap,Copper Standard Tap,Accessories,Cerami
YUYAO JINTIAN INDUSTRY & TRADE CO., LTD.
We are specially in the beryllium material, beryllium copper alloy and aluminum alloy. We mainly export to America, Southeast of Asia, Corea etc., and also we have agents in Australia and India. Sincerely welcome you to choose our manufactures..
Address:NO.192-5 XINJIAN ROAD, YUYAO CITY, ZHEJIANG PROVINCE, CHINA
Product/Service:Metal Beryllium, Beryllium Material, Beryllium Alloy, Beryllium Copper Rod, Tube, Plate, Strip, Wire, Foil, Beryllium Copper Electrode,Metal Beryllium, Beryllium Material, Beryllium Alloy, Beryllium Copper Rod, Tube, Plate, Strip, Wire, Foil, Beryllium Copper Electrode
Graphite Concept Products Co., Ltd
For more then 30 years we supply our graphite materials, semis and precise products for metallurgy foundry industries. Expanding business year by the moment have achieved 20,000 MT production output per with export activity in 20 countries Europe, Asia, Africa both Americas continents. Based on own raw ....
Address:Schwabber 12
Product/Service:Carbon/graphite products for metallurgy and foundry industries of steel, copper, aluminium and silicon metal production , Graphite for silicon metal production,Graphite for silicon metal production,Graphite for steel production,Graphite for aluminium production,Graphite Protective Sleeve,Arc Furnace Electrode,Anodes And Cathodes For Aluminium Electrolysis Cell,Graphite Furnace Lining,,Carbon/graphite products for metallurgy and foundry industries of steel, copper, aluminium and silicon metal production , Graphite for silicon metal production,Graphite for silicon metal production,Graphite for steel production,Graphite for aluminium production,Graphite Protective Sleeve,Arc Furnace Electrode,Anodes And Cathodes For Aluminium Electrolysis Cell,Graphite Furnace Lining,
BALAJI CABLE INDUSTRIES
Trade foe welding cable and welding electrode. We also provide isi marked welding cable in copper and almunium conductor welding cable in hofr and trs type of insulation. We also provide best quality og welding electrode 6013.
Address:Ajmeri Gate
Product/Service:Welding Cable, Welding Electrode , COPPER WELDING CABLE,HOSEPIPE FOR WELDING,WELDING CABLE 'PIONEERARC' BRAND,WELDING CABLE,,Welding Cable, Welding Electrode , COPPER WELDING CABLE,HOSEPIPE FOR WELDING,WELDING CABLE 'PIONEERARC' BRAND,WELDING CABLE,
JAECHANG METAL CO.,LTD.
A group of engineers from Korea and Japan, based on their 30 year long experience in manufacturing expertise know-how nonferrous metals copper alloys, finally estabilished JAECHANG Metal Co., Ltd. , which produces electrode material products for welding industries automotive precision industry, ....
Address:358-88 Galsan-dong
Product/Service:Copper alloy, Mold, Cap-tip, Contact-tip, Plate , Rolled Sheet,Drawn Bar,Forged Products,Forged Products,Forged Products,greeting,greeting,greeting,greeting,greeting,Electrode SEAM,SEAM,CO2-TIP (CONTACT-TIP),Cap-Tip,Copper ROD & BAR,Copper Plate,Casting Mold,Copper Alloy,,Copper alloy, Mold, Cap-tip, Contact-tip, Plate , Rolled Sheet,Drawn Bar,Forged Products,Forged Products,Forged Products,greeting,greeting,greeting,greeting,greeting,Electrode SEAM,SEAM,CO2-TIP (CONTACT-TIP),Cap-Tip,Copper ROD & BAR,Copper Plate,Casting Mold,Copper Alloy,
UM Cables Limited
UM Cables Limited (India) is a part of US $300 Million Usha Martin Group India's leading manufacturer and exporter Telecommunication Cables. Our Product Line Includes: 1. Copper Cables: Up to 2400 Pairs (For Telecom Use) 2. Fibre Optic 3. Cable TC (CATV) 4. Cat 3 Types We are currently looking for buyers ....
Address:701 Surya Kiran Building, 19 K. G. Marg
Product/Service:Copper Cables, Fibre Optic Cables , Cold drawn bright bars,Crane Rope,Electrode Quality Steel Wire Rods,High Cutting Steel Wire Rods,Spring Steel Wire Rods,Centreless ground bars,Shipping Ropes,CHQ Steel Wire Rods,Bearing Quality Steel Wire Rods,Crane Rope,Structural Rope,Elevator Rope,Engineering Rope,Aerial Rope,Free Cutting Steel Wire Rods,Low Carbon Steel Wire Rods,Peeled bars,Post Tensioning Product,Sling,Fine Cord,Bright Bar,Stranding Machinery,Cable Drawing Machinery,Flexi & Fancy Fence,Wire Drawing Machinery,Steel Cord for Conveyor Belt,Carbon Steel Wire Rods,Alloy Steel Wire Rods,Optical Fibre Cable,,Copper Cables, Fibre Optic Cables , Cold drawn bright bars,Crane Rope,Electrode Quality Steel Wire Rods,High Cutting Steel Wire Rods,Spring Steel Wire Rods,Centreless ground bars,Shipping Ropes,CHQ Steel Wire Rods,Bearing Quality Steel Wire Rods,Crane Rope,Structural Rope,Elevator Rope,Engineering Rope,Aerial Rope,Free Cutting Steel Wire Rods,Low Carbon Steel Wire Rods,Peeled bars,Post Tensioning Product,Sling,Fine Cord,Bright Bar,Stranding Machinery,Cable Drawing Machinery,Flexi & Fancy Fence,Wire Drawing Machinery,Steel Cord for Conveyor Belt,Carbon Steel Wire Rods,Alloy Steel Wire Rods,Optical Fibre Cable,
Electrical Overhead Corporation
We introduce our-selves as a manufacturer of overhead transmission line-material like GANG OPERATED AIR BREAK SWITCH, DROPOUT FUSE HORN GAP AND OPERATING ROD for Dropout fuseOur experience in this line is more than 30 years. are dealing H.T. & L.T. Procelain Insulators, Transmission material and ....
Address:1885, Pada Pole, Gandhi Road,
Product/Service:GOAB Switch,Isolator,Drop Out Fuse,Epoxy Insulators,LT Insulators,HT Insulators,Porcelain Insulators,FRP Operating,Discharging Road,Safety Equipments,Earthing Equipments,GANG OPERATED AIR BREAK SWITCH,DROPOUT FUSE HORN GAP FUSE,OPERATING ROD , Earthing Electrode,Earthing Electrode,Copper Strip,Copper Plate,Copper Wire,Earthing Strip & Pipe with Funnel and Clamp,Earthing Wire,Earthing Plate,Earthing Material,Fire Bucket with Stand,Safety Belt,Rubber Hand Gloves & Safety Boot,Rubber Sheet,FRP Discharging Rod,FRP Operating Rod,Come Along Clamp,Connector,Connector,P.G. Clamp,Cable Jointing Kit,Lightening Arrester up to 400kv Class,11/22/33 KV Post Insulator,11/22/33 KV Pin Insulator,11 KV Disc Insulator,11 KV Disc Insulator,Drop Out Fuse,Drop Out Fuse,Drop Out Fuse,Drop Out Fuse,Drop Out Fuse,Drop Out Fuse,Drop Out Fuse,,GOAB Switch,Isolator,Drop Out Fuse,Epoxy Insulators,LT Insulators,HT Insulators,Porcelain Insulators,FRP Operating,Discharging Road,Safety Equipments,Earthing Equipments,GANG OPERATED AIR BREAK SWITCH,DROPOUT FUSE HORN GAP FUSE,OPERATING ROD , Earthing Electrode,Earthing Electrode,Copper Strip,Copper Plate,Copper Wire,Earthing Strip & Pipe with Funnel and Clamp,Earthing Wire,Earthing Plate,Earthing Material,Fire Bucket with Stand,Safety Belt,Rubber Hand Gloves & Safety Boot,Rubber Sheet,FRP Discharging Rod,FRP Operating Rod,Come Along Clamp,Connector,Connector,P.G. Clamp,Cable Jointing Kit,Lightening Arrester up to 400kv Class,11/22/33 KV Post Insulator,11/22/33 KV Pin Insulator,11 KV Disc Insulator,11 KV Disc Insulator,Drop Out Fuse,Drop Out Fuse,Drop Out Fuse,Drop Out Fuse,Drop Out Fuse,Drop Out Fuse,Drop Out Fuse,
HP Pvt Ltd
We manufacture, export and supply a range of mild steel bars. Our products are manufactured from superior quality billets which procured the leading vendors. take keen interest in developing special section profiles as per parties chemistry drawing. offer customization facility to customers who seek ....
Address:D. S Road
Product/Service:steel angle,canel,beam,fastners,copper , Mild Steel Round Bars,Mild Steel Square Bars,Customised Bars,Bright Round Bars,Flat Bars,Bright Square Bars,Thermo Mechanical Treatment Bars,Bucket Handle Wires,Binding Wires,Steel Wool Wires,Electrode Wires,Mild Steel Flat Wires,Cold Heading Quality Wires,High Carbon Wire,Descaled Wire,Galvanized Wire,CO2 Welding Consumable Wire,Galvanized Iron Sheets,Cold Rolled Sheets,Galvanised Corrugated Sheets,Colour Coated Sheets,Colour Coated Sheets,Hot Rolled Sheets,Fabricated Pipes,Seamless Pipes,Electro Resistant Welded Pipes,Galvanized Iron Pipes,Mild Steel Channels,Mild Steel Unequal Angle,Mild Steel Angles,T- Angles,Rails,,steel angle,canel,beam,fastners,copper , Mild Steel Round Bars,Mild Steel Square Bars,Customised Bars,Bright Round Bars,Flat Bars,Bright Square Bars,Thermo Mechanical Treatment Bars,Bucket Handle Wires,Binding Wires,Steel Wool Wires,Electrode Wires,Mild Steel Flat Wires,Cold Heading Quality Wires,High Carbon Wire,Descaled Wire,Galvanized Wire,CO2 Welding Consumable Wire,Galvanized Iron Sheets,Cold Rolled Sheets,Galvanised Corrugated Sheets,Colour Coated Sheets,Colour Coated Sheets,Hot Rolled Sheets,Fabricated Pipes,Seamless Pipes,Electro Resistant Welded Pipes,Galvanized Iron Pipes,Mild Steel Channels,Mild Steel Unequal Angle,Mild Steel Angles,T- Angles,Rails,
Kartal Metal Galvanized
KARTAL METAL GALVANIZ SAN.TIC.LTD.STI. has been founded in 1990 and started its manufacturing activities at the Ostim Organized Industrial Region. We processing by production of electrical earthing products manufactured with hot dip galvanizing. In a short time we have leader Turkey area tapes, ....
Address:Istanbul yolu
Product/Service:Galvanized steel strip,galvanized electode,galvanized mono wire,galvanized sheet,Copper wire,galvanized joint clamp,copper clamps , Hot Dip Galvanized Earthing Strips,Earthing Electrode,Hot Dip Galvanized Mono Wire,hot dip galvanized earthing plates,hot dip galvanized earthing clamp,,Galvanized steel strip,galvanized electode,galvanized mono wire,galvanized sheet,Copper wire,galvanized joint clamp,copper clamps , Hot Dip Galvanized Earthing Strips,Earthing Electrode,Hot Dip Galvanized Mono Wire,hot dip galvanized earthing plates,hot dip galvanized earthing clamp,
Anand Arc Ltd
Anand Arc Ltd an ISO 9001-2000 accredited company promoted by TECHNOCRATS having more than 40 years of experience in the steel wire and its products industry. The started it's manufacturing with a small base year 1980 general purpose Welding Electrodes later 1990 it added another located at Palghar ....
Address:30, Kala Udyog Premises, L. B. S. Marg, Bhandup (W) ,
Product/Service:Manufacturing Range, Wires For General Purpose, Wires For Spring, Wire For Braiding / Knitting / Screens / Filters, Wire For Ropes, Electro Polish Quality Wire, Mig / Tig Wire, Redrawing Quality Wires, Wire For Cold Heading, Wire For Welding Electrode, Packaging, Chemical Composition, Welding Consumables , Stainless Steel TIG Wire,Copper Coated (CO2) Wire,Stainless Steel Wires,Stainless Steel Wires,Stainless Steel Wires,Stainless Steel TIG Wire,Stainless Steel Wires,Stainless Steel Wires,Stainless Steel Wires,Stainless Steel Wires,Stainless Steel Wires,Stainless Steel Wires,,Manufacturing Range, Wires For General Purpose, Wires For Spring, Wire For Braiding / Knitting / Screens / Filters, Wire For Ropes, Electro Polish Quality Wire, Mig / Tig Wire, Redrawing Quality Wires, Wire For Cold Heading, Wire For Welding Electrode, Packaging, Chemical Composition, Welding Consumables , Stainless Steel TIG Wire,Copper Coated (CO2) Wire,Stainless Steel Wires,Stainless Steel Wires,Stainless Steel Wires,Stainless Steel TIG Wire,Stainless Steel Wires,Stainless Steel Wires,Stainless Steel Wires,Stainless Steel Wires,Stainless Steel Wires,Stainless Steel Wires,
S.M. INDUSTRIES
S.M. Industries comenced its production with manufacture of equipments for Wire & Cable Industry. Subsequently, started offering products MS Wire, SS and Welding wire industry. With a clear objective to cater the machinery requirements cable industry, SM have been carrying out extensive R D which has ....
Address:22 / 4, Meerut Road Indl. Area
Product/Service:STRAIGHT LINE WIRE DRAWING MACHINE,WIRE DRAWING MACHINE,GALVANISING PLANT,MIG WIRE PLANT,ELECTRODE PLANT,CRANES,CO2/ MIG WIRE PLANT,WELDED WIRE MESH MACHINE,FLUX CORE WIRE MACHINE,WELDED WIRE MESH,WIRE,HOIST,RENDRING PLANT,MEAT COOKER,SCREW PRESS,HAMMER MILL,PRE-BREAKER,SCREW CONVEY,LEATHER SHOES,LADIES HAND BAG , Vertical Takeup Unit,Copper wire drawing machine,Alluminium wire drawing machine,Flux core machine,Slitting Machine,FCW Machine,Metallurgical Cored Wire Machine,Tube Forming Machine,Low Carbon Wire Drawing Machine,Low Carbon Wire Drawing Machine,High Carbon Wire Drawing Machine,High Carbon Wire Drawing Machine-600mm,High Carbon Wire Drawing Machine-500mm,Straight Line Wire Drawing Machine,Straight Line Wire Drawing Machine,OTO Type Wire Drawing Machine,OTO Type Wire Drawing Machine,Wire Processing Machine,Wire Machine,wire making machine,Wire Drawing Machine,horizontal wire drawing machine,aluminium wire drawing machine,Heavy Wire Drawing Machine,Heavy Duty Wire Drawing Machine,carbon steel Wire Drawing Machine,stainless steel wire Drawing Machine,Pulley Wire drawing Machine,Pulley type Wire drawing Machine,metal wire drawing Machine,Low carbon steel wire drawing Machine,galvanized iron wire drawing Machine,,STRAIGHT LINE WIRE DRAWING MACHINE,WIRE DRAWING MACHINE,GALVANISING PLANT,MIG WIRE PLANT,ELECTRODE PLANT,CRANES,CO2/ MIG WIRE PLANT,WELDED WIRE MESH MACHINE,FLUX CORE WIRE MACHINE,WELDED WIRE MESH,WIRE,HOIST,RENDRING PLANT,MEAT COOKER,SCREW PRESS,HAMMER MILL,PRE-BREAKER,SCREW CONVEY,LEATHER SHOES,LADIES HAND BAG , Vertical Takeup Unit,Copper wire drawing machine,Alluminium wire drawing machine,Flux core machine,Slitting Machine,FCW Machine,Metallurgical Cored Wire Machine,Tube Forming Machine,Low Carbon Wire Drawing Machine,Low Carbon Wire Drawing Machine,High Carbon Wire Drawing Machine,High Carbon Wire Drawing Machine-600mm,High Carbon Wire Drawing Machine-500mm,Straight Line Wire Drawing Machine,Straight Line Wire Drawing Machine,OTO Type Wire Drawing Machine,OTO Type Wire Drawing Machine,Wire Processing Machine,Wire Machine,wire making machine,Wire Drawing Machine,horizontal wire drawing machine,aluminium wire drawing machine,Heavy Wire Drawing Machine,Heavy Duty Wire Drawing Machine,carbon steel Wire Drawing Machine,stainless steel wire Drawing Machine,Pulley Wire drawing Machine,Pulley type Wire drawing Machine,metal wire drawing Machine,Low carbon steel wire drawing Machine,galvanized iron wire drawing Machine,
IGC Metallurgy Ltd.
It is a pleasure to introduce our selves as one of the leading ZnO producer company at Turkey, named IGC Metal Ltd. and has metallurgical plant producing export zinc, copper from ore waste containing these metals other factories without creating environmental pollution. The was set up in 2005 after ....
Address:Istasyon Mah.
Product/Service:zinc,iron,silver gold,copper , Mill Scale,Pyrite ash,red iron oxide,zinc oxide,aluminum dross/slag/ash/powder,Graphite Electrode Scrap,,zinc,iron,silver gold,copper , Mill Scale,Pyrite ash,red iron oxide,zinc oxide,aluminum dross/slag/ash/powder,Graphite Electrode Scrap,
Tianjin Asia Bridge Welding Material Co., Ltd.
Tianjin Asia Bridge welding material widely used in vessels, boiler pressure vessel, bridges, railways, rolling stock, petroleum, chemical industry, metallurgy, high rise buildings, various machinery manufacturing and other areas of the national economy, enjoying a reputation. ....
Address:Rm B-807,KangNing Mansion,Xikang Road,Heping District, Tianjin, Tianjin, China
Product/Service:welding materials,Aluminum and aluminum alloy welding wire,Copper and copper alloy welding wire,Argon arc welding wire,Flux-cored wire,Gas shielded arc welding solid core wire,Submerged-arc welding wire,Surfacing electrode,Stainless Steel Electrode,Low Temperature Steel electrode,Low-alloy Steel Electrode,,welding materials,Aluminum and aluminum alloy welding wire,Copper and copper alloy welding wire,Argon arc welding wire,Flux-cored wire,Gas shielded arc welding solid core wire,Submerged-arc welding wire,Surfacing electrode,Stainless Steel Electrode,Low Temperature Steel electrode,Low-alloy Steel Electrode,
Optima Trade Corp.
We have the pleasure to introduce ourselves you.Our company, Optima Trade Corp. was founded in 2008 and been doing business with JAPAN as exporter& importer of general instrument, precision machinery & Parts molds, e. t. c a fine reputation.We can also supply casting iron specified functions.Nowadays we ....
Address:Rosedale Rm#2030, 724, Suseo-dong, Kangnam-ku
Product/Service:LED Package,LED Module,Copper Alloy,Casting iron,automobile parts , Cast Iron-stainless steel,Cr Copper Alloy Electrode,,LED Package,LED Module,Copper Alloy,Casting iron,automobile parts , Cast Iron-stainless steel,Cr Copper Alloy Electrode,
LithomelT Co., LTD
We are manufacturer of copper mould tube and flanges in China.We have the best quality competitive price.We welcome your visit inquiry. Product description : 1)Copper Material:CU-DHP, CU-AG Squre :90x90. 100x100. 110x110. 120x120. 130x130. 140x140. 150x150. 160x160. 200x200. etc. Rectangular ....
Address:renmin road, dalian, liaoning, China
Product/Service:copper mould tube, flange, pipe fitting,Graphite electrode,Oxygen lance nozzle,Copper crucible,Flange,Copper mould tube,,copper mould tube, flange, pipe fitting,Graphite electrode,Oxygen lance nozzle,Copper crucible,Flange,Copper mould tube,
Artash Composite
Artash Engineering Company was established in 1980's and began design manufacturing of industrial furnaces. Growing to one the biggest furnace makers Iran company's activity expanded rapidly fabrication pressure vessels post weld heat treatment steel structures. In 1997 an enthusiastic ....
Address:#450 Mirdamad ave, Tehran, Other, Iran
Product/Service:oxide dispersion strengthened copper&amp,High Conductivity Copper Strips,Electrical and wear parts,Spot welding electrode tips,,oxide dispersion strengthened copper&amp,High Conductivity Copper Strips,Electrical and wear parts,Spot welding electrode tips,