Solutions:
Lacks of Penetration
Possible Reasons:
1. Combination preparation is wrong.
2. Applied welding technique is wrong.
3. Heat input is insufficient.
Solutions:
Root Sagging
Possible Reasons:
1. Welding speed is too low.
2. Current is too high when compared to the voltage.
Expressweld MasterMIG 500W
Page 35
1. Clean scale and oxide residues from all surfaces in welding seam area.
2. Increase wire feeding speed and arc voltage. Decrease free wire length.
3. To control the weld puddle easier, do not weld with extreme oscillating. Increase the
advancing speed.
4. If you are performing oscillating welding, wait a while at seam corners. Enhance access
to root of seam. Route the welding wire to the front of weld puddle. Adjust the torch
angle in corner welding.
5. To enable access to seam soul, adjust combination angle properly. To fuse seam
corners, adjust free wire length or prepare (J) or (U) seam.
6. Decrease wire feed speed.
1. To access to the soul of seam, with the condition to provide correct free wire length and
arc characteristics, revise connection shape and connection preparation. Avoid that the
height in the root is extremely high. In butt joint welding, increase root opening or deepen
the groove opened reversely.
2. To achieve maximum penetration, hold the welding wire perpendicular to workpiece.
Route the arc to the front of weld puddle.
3. Current may be too low when compared to the voltage. Increase the wire feeding speed,
so the current. Do not change the free wire length.
