by P. van Erk, D. Fleming
The Lincoln Electric Company
How to reduce arc blow
As mentioned before, existing magnetism in the steel can be “removed” by demagnetizing the steel by various methods.
Suffice it to say that welding even on a fully demagnetized steel can exhibit arc blow, which is why it is important to
apply other remediation techniques. Arc blow originating from the welding process can be reduced by various
methods which include amongst others;
Reduce the welding current
Use a shorter arc length
Make a heavy tack on both ends on the seam and several tack welds throughout the seam.
Weld towards a tack or a weld that is already made
Weld away from the ground to reduce backwards directed arc blow
Weld towards the ground to reduce forward directed arc blow
Apply a welding process using alternating (AC) current
More practical details and recommendations to combat arc blow are found in the Procedure Handbook of Arc Welding
published by The James F. Lincoln Arc Welding Foundation.
This article has been published before as part of the 20th Technical sessions of welding and joint technologies
Madrid, October, 1st, 2nd and 3rd, 2014 organised by CESOL (Asociación Española de Soldadura y Tecnologías de Unión)
Download full article