What is Slag Follow in Welding?

Slag follow is the ability of the slag to flow along with the puddle during welding. This is important because it can affect the weld quality and speed.

  • If the slag is too close to the puddle, it can crowd it and make it difficult to observe the arc.
  • If the slag follows too fast, it can allow for faster travel speeds.

Good slag follow is when the puddle is clear with the travel speed at a rate that keeps the puddle oblong. This allows for proper weld quality and speed. Improper slag follows can result in welding defects and slower welding speeds.

What causes welding slag?

Slag is produced during welding when the electrode melts and releases flux. The flux forms a protective layer over the weld pool, which helps to prevent oxidation and contamination.

As the weld cools, the slag hardens and protects the weld until it is removed.

How do you remove welding slag?

The slag must be removed before the next weld pass can be made. This is typically done with a chipping hammer, wire brush, or grinding wheel.

What type of welding produces slag?

Slag is produced during shielded metal arc welding (SMAW), flux-cored arc welding (FCAW), and submerged arc welding (SAW).

What is slag inclusion in welding?

Slag inclusion is when slag becomes trapped in the weld. This can happen if the slag does not follow the puddle properly or if it hardens too quickly. Slag inclusion can cause welding defects and should be avoided.

Related Links

Slag Cement Association About Slag Cement IS-05
Slag Treatment
Fundamentals of EAF and Ladle Slags and Ladle Refining Principles
National Slag Collection – The Historical Metallurgy Society
Slag – Jernkontoret

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