What are 3 weld defects that are found in MIG welding?

Typical weld defects found in MIG welding are lack of fusion and penetration, craters and cracks, undercut, burn-through, and porosity in the weld metal.

What are the 3 basic types of cracks in the weld metal?

Cracks in the Weld Metal We can divide weld metal cracks into three types: Transverse, longitudinal and crater cracks.

What are discontinuities in welding?

Weld discontinuities can be defined as “an interruption of the typical structure of a weld, such as a lack of homogeneity in the mechanical, metallurgical or physical characteristics of the weld.” Weld discontinuities include porosity, slag inclusions, incomplete fusion, incomplete joint penetration, excessive melt- …

What is one of the most common problems with MIG welds?

Porosity, one of the most common MIG welding defects, is the result of gas becoming trapped in the weld metal. Inadequate shielding gas coverage is among the biggest culprits, and this can be addressed in several ways.

What are the problems in MIG welding?

This article describes some of the most common MIG welding defects, such as porosity, lack of fusion and burn through and how to identify them by weld bead appearance. Some of the most common weld defects are porosity, lack of fusion and burn through, with aluminum presenting a few more welding challenges than steel.

Why are my MIG welds cracking?

Cracking can be caused by many different problems from rapid cooling to contamination. But in almost all cases, the reason cracking occurs is because the internal stresses exceed either your weld, your base metal or both. After you weld, both your base metal and your weld begin shirking as they cool.

Do all welds have discontinuities?

This means that you can have weld discontinuities and still have an acceptable weld. However, we always want welds free of discontinuities whenever possible. Below are 10 of the most common types of weld discontinuities.