Weldforce 155
M &
175
MST
© Weldclass 2020 | E.&O.E.
35
there is much less downtime in replacing filler wire. MIG can also weld with thin wires at low
amperages achieving great results on thin materials. At the same time, bigger diameter wires and
higher amperages can be used to weld thicker materials with good penetration. When a shielding
gas is used there is no flux formed on the weld so clean up is minimal.
10.2.3.4
Limitations
MIG welding with shielding gas cannot be done in windy environments. However, in many
applications gasless/self-shielding wires are available that don’t require gas. MIG traditionally
requires a higher level of skill and experience to be able to balance voltage and wire speed settings
well to achieve a quality result. However, the Synergic programs on this machine make this this very
easy and much more foolproof.
10.2.3.5
Materials
MIG welding can be used with a wide variety of wires including steel, stainless steel, gasless wires,
aluminium, silicone bronze & hard facing just to name a few.
10.3
Joint Preparations
In many cases, it will be possible to weld steel sections without any special preparation. For heavier sections
and for repair work on castings, etc., it will be necessary to cut or grind an angle between the pieces being
joined to ensure proper penetration of the weld metal and to produce sound joints. In general, surfaces
being welded should be clean and free of rust, scale, dirt, grease, etc. Slag should be removed from oxy-cut
surfaces. Typical joint designs are shown in the following figures.
Figure 19
Figure 20
Figure 21
Figure 22
Figure 23
Figure 24
