What is a Hot Crack in Welding?

Hot crack is a type of welding defect that results from stress concentration in the weld metal. This can happen when the weld metal freezes last, which is why it’s also known as auto-crack or crater crack. Hot cracks can occur at the root or in the crater of the weld and can be a serious problem if not caught early.

How do I stop hot cracking?

In order to prevent hot cracks, it’s important to use proper welding techniques and procedures. For example, using a lower heat input and preheating the base metal can help reduce the risk of hot cracking. If you suspect that a hot crack may have already formed, discontinue welding and inspect the area carefully. If necessary, consult a welding engineer for assistance.

What causes a hot crack?

There are several factors that can contribute to hot crack formation, including:

  • Inadequate welding procedures.
  • Welding too rapidly.
  • Improper heat input.
  • Excessive restraint on the weld.

If any of these factors are present, it’s important to take measures to correct them before continuing with the weld. By understanding the causes and prevention of hot cracks, you can help ensure that your welds are strong and free from defects.

What is hot crack and cold crack?

Hot crack and cold crack are both welding defects that can occur when the weld metal freezes last. Hot cracks tend to occur at the root or in the crater of the weld, while cold cracks typically form on the surface of the weld. Both hot and cold cracks can be serious problems if not caught early.

Types of cracks in welding

There are 3 main types of cracks that can occur in welding: hot, cold, and lamellar.

Related Links

Corrosionpedia – What is a Hot Cracking? – Definition from Corrosionpedia
What is hot cracking (solidification cracking)? – TWI
Welding defect
Hot Crack – an overview | ScienceDirect Topics
Hot Crack: How it occurs and how it can be prevented – Welding Engineers NZ