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Under filling in a weld joint is due to:


1. melting away of base metal
2. incomplete filling of weld joints
3. low temperature of welding
4. incomplete fusion

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Correct Answer - Option 2 : incomplete filling of weld joints

Explanation:

Welding Defect is as follows.

Defect

Explanation

Incomplete fusion

If there is no melting of the edges of the base metal at the root face or on the side face or between the weld runs

Incomplete penetration

Failure of the weld metal to reach the root of the joint is known as incomplete penetration.

Undercutting

A groove or channel formed in the parent metal at the toe of the weld is called an undercut.

Porosity or blow-hole

A group of pin-holes in a weld (porosity) or a larger hole in the weld (blow-hole) are caused by the gas being entrapped.

Spatters

An unintentional deposit of weld metal, in the shape of small globules on the job surface along the weld, is known as spatters.

Under filling ​Incomplete filling of weld joints

Overlap

Metal flowing onto the surface of the base metal without fusing it.

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