What is Linear Indication in Welding?

The linear indication is a test result in which a discontinuity in the material being tested is displayed as a linear or aligned array. This type of indication can be caused by various factors, including:

porosity,
incomplete penetration,
slag inclusion,
lack of fusion,
and others.

In some cases, linear indications may also be caused by thermal or mechanical stresses. Linear indications are often found in welding applications and can be detrimental to the overall quality of the weld.

Linear indications can be difficult to detect and may require specialized testing methods in order to be properly identified. In some cases, linear indications may only be visible under certain conditions, such as when viewed with a microscope or other magnifying device. Additionally, linear indications may be hidden by other weld defects, such as underbead cracks or slag inclusions. As such, it is important to carefully inspect welds for any potential linear indications before proceeding with further testing or inspection.

Linear indications can have a variety of causes but are most often the result of welding defects. Incomplete penetration, porosity, lack of fusion, and slag inclusion are all common causes of linear indications. Additionally, thermal or mechanical stresses can also lead to the formation of linear indications.

What is an elongated indication in radiography?

Elongated indications are linear indications that are stretched or lengthened in comparison to their width. Elongated indications can be caused by a variety of factors, including:

incomplete penetration,
porosity,
slag inclusion,
lack of fusion,
and others.

How do you identify weld defects?

Weld defects can be identified using a variety of methods, including:

visual inspection,
ultrasonic testing,
radiographic testing,
magnetic particle testing,
penetrant testing, and others.

What is an arc Strike in welding?

Arc strike is a type of welding defect that occurs when the arc forms outside of the intended weld area. This can happen if the welder begins the arc before the electrode is properly positioned, or if the welder loses control of the arc while welding. Arc strike can also occur if the welding machine is not properly set up, which can cause the arc to form in an unintended location.

Linear indication vs crack

A linear indication is a test result in which a discontinuity in the material being tested is displayed as a linear or aligned array. A crack, on the other hand, is a type of discontinuity that forms when the material is subject to stress.