Introduction
Incomplete
Penetration
Lack of
Longitudinal
Undercutting
Fusion
Porosity
Cracking

 

 

 

Variations-
Metal
Transfer
Equipment
Power
Supply
Shielding
Gases
Wire
Electrodes
Safety
Welding
Techniques
Welding
Conditions
Economics
Weld
Defects
Mig Spot
Welding
Tables

 

4 Figure 10-2 – Example of Lack of Fusion The best safeguard against this is to remove all oxide as soon before welding as possible. Although iron oxide (rust, mill scale) can be welded over in mild steel, an excessive amount can cause lack of fusion.