What is Linear Discontinuity in Welding?

In welding, linear discontinuity refers to a break or crack in the weld that is substantially longer than it is wide. This can occur for a variety of reasons, including poor welding technique, incorrect welding parameters, or damaged welding equipment. Linear discontinuities can weaken the weld joint and cause it to fail prematurely. Therefore, it is important to identify and fix any linear discontinuities as soon as possible.

There are several methods that can be used to detect linear discontinuities, including:

visual inspection,
X-ray inspection,
and ultrasonic inspection.

Once a linear discontinuity has been found, it can be repaired by welding over the affected area.

What causes discontinuity in welding?

There are several possible causes of linear discontinuity in welding, including:

Poor welding technique: If the welder does not have the proper skills or training, they may not be able to create a continuous, strong weld. This can result in linear discontinuities.
Incorrect welding parameters: If the welding machine is not set to the correct welding parameters (e.g., voltage, current, speed, etc.), the weld may be weak and contain linear discontinuities.
Damaged welding equipment: If the welding torch or other equipment is damaged, it may not create a continuous weld and linear discontinuities may form.

How to fix linear discontinuity in welding?

If a linear discontinuity is found, it is important to fix it as soon as possible. The most common way to repair linear discontinuities is by welding over the affected area. This will add new material to the weld joint and help to reinforce it.

What is the difference between defect and discontinuity?

A discontinuity is an imperfection in a material that does not affect the performance of the material for its intended use. A defect is an imperfection that does affect the performance of the material for its intended use. Therefore, all defects are discontinuities, but not all discontinuities are defects.

Which weld metal discontinuity is generally considered to be the most severe?

The most severe weld metal discontinuity is generally considered to be a crack. Cracks can propagate quickly and cause the weld joint to fail. Therefore, it is important to identify and repair any cracks as soon as possible.