Feeding Speed - ARCCAPTAIN MIG205 MP User Manual

Angle to Work

The work angle is the forward back angle of the gun relative to the work piece.The correct work angle
provides good bead shape, prevents undercut, uneven penetration, poor gas shield and poor quality
finished weld.
Correct angle
good level of control over the
weld pool, even flat weld
Stick Out

Stick out is the length of the unmelted wire protruding from the end of the contact tip. A constant even
stick out of 0.2-0.4in will produce a stable arc, and an even current flow providing good penetration and
even fusion. Too short stick out will cause an unstable weld pool, produce spatter and over heat the
contact tip. Too long stick out will cause an unstable arc, lack of penetration, lack of fusion and increase
spatter.
5-10m
m

12.2 Feeding Speed

Feeding speed refers to how quickly the gun is moved along the weld joint, measured in inches per
minute. It can vary based on conditions and the welder's skill, limited by their ability to control the weld
pool. The push technique allows for faster feeding speeds compared to the drag technique. Gas flow
should match the feeding speed, increasing with faster feeding and decreasing with slower speed.
Feeding speed should match the amperage and decreases as material thickness and amperage
increase.
Too Fast Feeding Speed

Too fast feeding speed results in insufficient heat per inch of travel, leading to less penetration and
reduced weld fusion. The weld bead solidifies quickly, trapping gases inside and causing porosity.
Undercutting of the base metal may occur, leaving an unfilled groove in the base metal.
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Not enough angle
less control over the weld pool
more spatter
Figure 74
Normal stick out
Even arc, good penetration
even fusion, good finish
Figure 75
poor control, unstable arc,less
penetration, lots of spatter
Too short
Unstable arc, spatter, over
heat contact tip
58
Too much angle
Too long
Unstable arc, spatter, poor
penetration and fusion