How to weld > Magnetic arc blow
Welding with A.C.
Electrodes connected to A.C. are less prone to arc blow in the joint compared to those coupled with D.C.
The reasons are that:
- The direction of the magnetic field around the electrode continuously changes making it less susceptible to external sources of magnetism.
- Welding with A.C. introduces eddy currents into the joint, see fig…, which reduces the negative effect from an external magnetic field.
Induction of eddy currents in the joint.
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