What are the possible failures in welded joints?

The defects which may fail a weld joint during service if left in a component undetected are the following: creaks, lack of penetration, lack of fusion, porosity etc. Among these defects, the linear ones such as the lack of penetration, lack of side wall fusions etc. and particularly the cracks are more harmful.

What is the most common cause of failure in root bend tests?

Most bend test specimens have smaller widths, perhaps as low as two times the specimen thickness. The higher stresses in the cross direction can induce flaws that are pooly oriented for failure due to the longitudinal stress to fail under the cross direction stress.

What causes welds to fail?

Insufficient weld size — because of design errors or incorrect interpretation of the part design – can lead to weld failures. A weld that is too small or too short for the application can fail from tension, compression, bending or torsional loads.

What is a weld bend test?

The bend test is a simple and inexpensive qualitative test that can be used to evaluate both the ductility and soundness of a material. It is often used as a quality control test for butt-welded joints, having the advantage of simplicity of both test piece and equipment.

What makes a weld weak?

If the joints are not heated hot enough, when they are being formed, problems will ensue. You can’t weld a hot object to a cold object; they have to be hot at the same time that you weld. Failing to properly heat both components of the joint would result in a weak weld.

Why is bending test important?

Where should a fillet weld test sample fail?

Whether the pieces separate or just bend the surfaces must be examined. If you can see the root (the straight edge of the vertical piece) the welder fails. Fillet break tests reveal whether the welder was able to achieve root fusion over a section of joint rather than a single spot.

Why is my weld weak?

What are common welding defects?

What are common weld defects?

• Lack Of Penetration or Incomplete Penetration.
• Lack Of Fusion or Incomplete Fusion.
• Undercut.
• Spatter.
• Slag Inclusions.
• Cracks.
• Porosity.
• Overlap.