http://www.thefabricator.com/ResistanceWelding/ResistanceWelding_TechCell.cfm The Resistance Welding tech cell is packed with specific links to help you find product information, suppliers, technical articles, case studies, seminars and conferences, as well as books, software, and videos on metal fabricating-related topics. en-us http://www.thefabricator.com/RSS/images/thefabricator_rss.gif http://www.thefabricator.com Copyright 2007 FMA Communications, Inc. All rights reserved. official publication date Tue, 21 Aug 2007 11:18:44 AM CDT Vicki Bell Laurie Harshbarger http://www.thefabricator.com/ResistanceWelding/ResistanceWelding_Article.cfm?ID=1688 Figure 1 This schematic of a weld setup shows top and bottom electrodes (red) holding parts to be welded. Rw is the total of all resistances that directly or indirectly contribute heat to the weld interface; Rw is the sum of multiple contact/interface resistances and bulk resistances. Ro is the sum of all resistances between the voltage clips that do not contribute heat to the weld interface. Resistance welding is a unique welding process in which direct feedback from the weld i... Girish Kelkar, Ph.D Wed, 08 Aug 2007 12:00:00 AM CDT http://www.thefabricator.com/ResistanceWelding/ResistanceWelding_Article.cfm?ID=993 The nickel cross-wire weld on the left was made with single-impulse resistance welding. Material squeezed out from the weld is attached to the wires near the weld location.The nickel cross-wire weld on the right was made with four impulses.A reduced amount of material is squeezed out from the weld. Resistance Welding: Background As its name implies, resistance welding uses the resistance of the parts in the current path to generate heat energy for welding. Heat is generated in the pa... Girish P. Kelkar, Ph.D., Contributing Writer Tue, 09 Nov 2004 12:00:00 AM CST http://www.thefabricator.com/ResistanceWelding/ResistanceWelding_Article.cfm?ID=912 Before introducing new resistance welding systems, Ford Motor Company’s New Model Product Development Center was cluttered and dark, and it was difficult to work there because of the high number of weld controls and weld guns being used (left). Installing weld controls and associated manual transguns helped the center reduce the number of weld control systems and simplify the hanging stations to make the facility more open, better organized, cleaner, and ergonomic. Ford Motor Company... Tue, 08 Jun 2004 12:00:00 AM CDT http://www.thefabricator.com/ResistanceWelding/ResistanceWelding_Article.cfm?ID=784 This three-phase, mid-frequency inverter is a dual-gun projection welding machine with a pneumatically operated lift table for the workpiece. Although mid-frequency technology isn’t new, North American buyers are increasingly turning toward their benefits, equipmentmakers say. Getting control over the resistance welding process might seem sometimes like catching a frog with boxing gloves on. However, as end user quality demands increase and other welding processes encroach on r... Lincoln Brunner, Contributing Writer Thu, 20 Nov 2003 12:00:00 AM CST http://www.thefabricator.com/ResistanceWelding/ResistanceWelding_Article.cfm?ID=256 An in-depth examination of electric resistance welding (ERW) weld nuggets as a quality control step in the manufacturing of high-strength tube and pipe used for pressure applications has been a proprietary procedure for some manufacturers for several years. Types of pressure-application tube and pipe are cross-country line pipe, such as API 5L grades for the transmission of oil and gas; down-hole casing for oil and gas wells; and pipe used in oil and gas refineries. This article focuses on... Lew Warren, Contributing Writer Tue, 24 Apr 2001 12:00:00 AM CDT http://www.thefabricator.com/ResistanceWelding/ResistanceWelding_Article.cfm?ID=255 To most manufacturers, spot welding is the most economical way to join two pieces of sheet metal. While joining sheet metal is the most common use for the process, resistance welding (RW) equipment actually can be used for a large variety of joining and heat-treating projects, some of which are not so well-known. Resistance Welding Annealing Annealing of production components often is required. While sending these parts through an annealing oven can be economical, heating entire components... Roger B. Hirsch, Contributing Writer Tue, 24 Apr 2001 12:00:00 AM CDT http://www.thefabricator.com/ResistanceWelding/ResistanceWelding_Article.cfm?ID=89 Figure 1 The pressure generated during the forge welding process extrudes foreign particles, such as oxides and debris, from the weld zone. This extruded material forms a weld bead on the OD and ID of the tube. Several electric resistance welding (ERW) processes are available for tube and pipe production. While each process has different characteristics, all ERW processes have one thing in common–all of them produce a forged weld. A forged weld is created by applyin... Gerald Weimer and Ray Cagganello, Contributing Writers Thu, 13 Jun 2002 12:00:00 AM CDT