GMAW (Gas Metal Arc Welding) GMAW Training: Half-Day Course
(click here for brochure) GMAW, previously known as MIG welding,
is one the most commonly used arc welding process in the
automotive industry. Benefits include high production speeds and
ability to add filler metal for strength. This course introduces
users to fundamentals of GMAW starting with an introduction to
process physics including welding modes (spray transfer and
globular transfer), effect of polarity, and torch angle. In the
second section, we will review steel metallurgy and chemistry as
it relates to solidification of steels and formation of
different phases such as austenite, ferrite, and martensite;
effect of alloying elements and impurities on weld quality and
defect formation will also be presented. The next section covers
process variables such as voltage/current control, shielding
gases, wire speed, electrode orientation, and joint position.
The following section will cover weld defects (overlap,
undercutting, underfill, porosity, i