How can the lack of fusion defects be prevented ?
How can the lack of fusion defects be prevented ? use a sufficiently wide joint preparation select welding parameters (high current level, short arc length, not too high a welding speed) to promote penetration into the joint side wall without causing flooding ensure the electrode/gun angle and manipulation technique will give adequate side wall fusion use weaving and dwell to improve side wall fusion providing there are no heat input restrictions if arc blow occurs, reposition the current return, use AC (in MMA [SMA] welding) or demagnetise the steel Join For PCN Welding Inspector Level 2 Program for Knowing More on Welding Technology and It's Details http://decibelnde.com/weldinginspector.php