Arc Blow Control Calculator
Diagnose arc blow cause and get corrective recommendations.
Arc Blow Severity by Situation
| Situation | Severity | Primary Fix |
|---|---|---|
| Corner/Edge Welds | High | Use AC or wrap ground |
| Arc Restarts | High | Angle electrode back |
| Deep Groove | Medium | Reduce amperage |
| Pipe Circumferential | Medium | Wrap ground cable |
| Long Seams | Low-Med | Move ground ahead |
Understanding Arc Blow
What Causes Arc Blow?
Arc blow is the deflection of a welding arc from its normal path due to magnetic forces. DC welding creates a magnetic field that can be distorted by the workpiece geometry, ground location, or external magnetic fields.
Types of Arc Blow
- Forward Blow: Arc pushed toward unwelded joint - common at end of weld
- Backward Blow: Arc pushed toward completed weld - common at start
- Lateral Blow: Arc pushed sideways - uneven magnetic field
- Thermal Arc Blow: Caused by temperature gradients, not magnetic
Prevention Strategies
- Use AC: Alternating current eliminates magnetic arc blow
- Ground Placement: Position ground to balance magnetic field
- Electrode Angle: Lean into the direction of blow
- Reduce Arc Length: Shorter arc is more stable
- Demagnetize: For severe cases, demagnetize before welding