One of the most important factors to
consider in mig welding is the correct filler wire selection. This wire, in
combination with the shielding gas will
produce the deposit chemistry that determines the resulting physical
and mechanical properties of the weld.
Basically, there are five major factors that influence the choice of
filler wire for mig welding.
1. Base plate chemical
composition 2. Base
plate mechanical properties 3. Shielding
gas employed 4. Type
of service or applicable specification requirements 5. Type
of weld joint design. However,
long experience in the welding industry has generated American Welding Society
Standards to greatly
simplify the selection. Wires have been developed and manufactured that consistently
produce the best
results with specific plate materials. Although there is no industry-wide specification,
most wires con- form
to an AWS standard.