← Glossary

Magnetic Impelled Arc Butt Welding

Magnetically impelled arc welding is a pressure welding process for pipes where a rotating arc is guided by a magnetic field over the joint faces and then upset. The magnetic field prevents material run-out and improves the weld.

Physico-chemical mechanism of action

A magnetic field affects the movement of electrons in the metals. In magnetic flux containment welding, the magnetic field keeps the molten material from running out by moving the electrons and thus holding the surface.

Metallurgical relevance & welding risks

The magnetic field improves weld strength and prevents porosity. However, missing or too weak magnetic fields can lead to incomplete fusion and cracking.

Workshop practice & instructions

Ensure the magnetic field is stronger than 1 Tesla. Arc currents should be 200 amperes. Cool the pipes slowly after welding to prevent porosity.

MetallurgieSchweißtechnik

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