June 17, 2008
When MIG welding, are you experiencing an erratic, sputtering arc; a gradual need to increase voltage at the power source; discoloration of copper cable strands or the liner; increased contact tip burnbacks; or inconsistent weld appearance? If so, your problem could be poor conductivity caused by electrical resistance.
September 11, 2007
Incorrect contact tip recess can cause excessive spatter, burn-through and warping, insufficient penetration, and porosity. Welders who become familiar with correct tip recess can avoid these problems as well as unnecessary equipment upgrades yet still improve GMAW quality.
August 22, 2007
Using an inappropriate gas mixture and consumables for a particular GMAW application can cause porosity and excessive spatter, factors that diminish weld quality. Which gases work best with which materials? Why is nozzle selection important? This article addresses these and other questions about GMAW gas and consumables.
January 10, 2006
Torches, cables, and cooling are three integral components in gas metal arc welding (GMAW) and gas tungsten arc welding (GTAW) equipment, and two cooling methods – air and water – are used in their cooling systems. Although GMAW and GTAW are different processes, the advantages and disadvantages of water- and air-cooled systems are the same. For that reason, you should consider similar factors when choosing a GMAW or GTAW system.