The blowing-arc-effect during welding

The blowing-arc-effect during welding

In arc welding, there is a subtle force that is often overlooked but has a significant impact on the quality of the weld: the blowing-arc-effect. This phenomenon can be both a challenge and a tool for welders, depending on how it is utilized.

The phenomenon of the blowing-arc-effect

Turbulence can occur at the tip of the electrode or stud, which can introduce unwanted gases into the weld pool. The consequences can be manifold, from oxidation and burns to pores in the weld seam. The blowing-arc-effect only occurs when welding with an arc.

Causes and effects

The blowing-arc-effect is caused by the electromagnetic fields that inevitably form around current-carrying conductors. These magnetic fields interact with each other and create turbulence, which can "flush" air and welding gas into the weld pool and thus impair the welding quality. An experienced welder can often recognize the blowing-arc-effect by the fact that the stud is welded more strongly on one side than on the opposite side, accompanied by an uneven flow and heavy spattering during the welding process.


Illustration of the blowing-arc-effect

Using the blowing-arc-effect to your advantage

Despite its potentially negative effects, the blowing-arc-effect can also be used to advantage, particularly in certain welding applications such as drawn arc stud welding in the PC position, i.e. horizontal welding. In such cases, gravity can cause the molten material to flow downwards. If the arc is deflected slightly upwards, a uniform weld with a closed bead and no undercut can be created.

Welders can take specific measures to utilise the blowing-arc-effect for a uniform weld seam without undercutting. By attaching earth clamps below the weld and aligning the stud welding gun in a position in which the cable bend is also below the weld, the arc can be deflected slightly upwards. At the same time, the welding current can be increased slightly and the welding time minimised slightly to achieve optimum results.


The blowing-arc-effect may seem like an undesirable phenomenon at first glance, but with the right understanding and application, it can become a valuable tool for welders. By specifically controlling and utilising the blowing-arc-effect, welders can improve the quality of their welds and achieve good welding results.

Published on

Written by

Markus Neuse



Related articles


KÖCO at the EuroBLECH 2022

Four successful trade fair days in Hanover When, after four years and a forced break, the industry returned to EuroBLECH in Hanover at the end of October, KÖCO was of course there. After all, we had big plans - keyword "BRUNO". It was foreseeable that many companies and visitors would use the trade …

KÖCO makes stud welding a service experience!

We know the problems of stud welding and the challenges our customers face every day on the construction site. And we know how important good service and solutions are in these moments. That's why we are now stronger than ever and fully committed to being a strong and reliable partner to help you …