What is Arc Blow in Welding?
Welding with a direct current may set up a magnetic field in the steel plate being welded. This magnetic field causes the arc to flutter and blow, creating difficulty in controlling the arc.
What is arc blow and when does it occur?
Arc blow is a welding defect that can occur when welding with a direct current. It is caused by a magnetic field that sets up in the steel plate being welded, and this causes the arc to flutter and blow, making it difficult to control. An Arc crater is an area of the weld that has been damaged by an arc blow.
What is arc blow and how is it controlled?
Arc blow is controlled by using a lower welding current, changing the type of electrode being used, or increasing the amount of magnetic flux in the steel. The position of the welding torch can also be changed to help control arc blow.
How does arc blow affect welding?
Arc blow can make it difficult to control the arc, and it can also cause the weld to be of poor quality.
Causes of arc blow in welding. How to reduce arc blow in welding?
The main cause of arc blow is the presence of a magnetic field in the steel plate being welded. There are several ways to reduce arc blow, including:
- using a lower welding current,
- changing the type of electrode being used,
- increasing the amount of magnetic flux in the steel,
- or changing the position of the welding torch.
Related Links
Preventing Arc Blow
Arc blow
Preventing Arc Blow
How do you prevent arc blow? – TWI
Welding: What is arc blow?
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