An Overview of GMAW Including Applications, Common Problems and Solutions

Abstract

Gas Metal Arc Welding (GMAW) is said to be one of the easiest welding processes to learn and use. Because of its high deposition rates and little post-weld cleaning required, GMAW is a popular choice for a variety of applications including almost all commercially important metals. Another factor contributing to the widespread use of GMAW is the various modes of metal transfer including short circuit, spray, surface tension transfer (STT), etc. These different modes of transfer enable GMAW to be tailored to different situations. For instance, some applications may require deep penetration or other applications may be for welding very thin sections. However, these factors along with others may result in inferior welds if not monitored closely. Problems such as weld porosity, lack of fusion, and lack of shielding gas coverage can all lead to inadequate welds which can lead to larger problems if not corrected. Many common drawbacks to the GMAW process can be remedied quite easily with proper time and attention. Taking the time and effort to produce a sound weld may, however, negate the superior deposition rates of GMAW thereby limiting its use to fewer applications. This welding process can be extremely effective when used properly. However, the key is to not sacrifice weld quality for the sake of production. GMAW applications, modes of transfer, along with common problems and solutions associated with the process will all be discussed and detailed.