By conducting a welding inspection, the different characteristics of a weld can be evaluated. Some of which can be related to the size of the weld while others are related to the presence of the welds’ discontinuities or weld defects.
What is Welding Inspection?
Welding inspection is the use of technological applications to inspect or assess the quality of the welds. It is also to confirm the presence, location and coverage of the welds.
In the field of manufacturing, the welds are used to connect two or more metal surfaces. As the welds carry the brunt of loads, it can encounter fatigue which may be detrimental if proper inspection is not carried out.
There are many reasons as to why welding inspection should be carried out. However, the most prominent reason is to ensure that the welds are of the quality that will allow them to carry out their performance to the max.
In most cases, quality of the welds is determined on the basis of which functions it performs. There are some few ways to tell if a weld is correct.
One way through which you can know if a weld is correct is through its distribution between two surface materials. It must be equally distributed.
The weld should be free from any wastes such as slag. After cooling, the slag should be removed easily.
The surface of the weld should not consist of any irregularities, bumps or porous holes (porosity). Porous holes usually indicate weakness.
The joints must be tight. If not, then it points to a weld problem.
If you are working on an item that contains liquid or gas, a leak is a sure and an obvious way to guess if there is any problem or not.
If the welds are not able to demonstrate the required strength, then that is also another way to determine if the weld is correct.
The Types of Welding Inspection
1) Visual Inspection
Visual Inspection is the most common welding inspection method. In this, the naked eye is used to analyse the weld material for any defects. If implemented efficiently, it is the most inexpensive method to get good results.
2) X-Ray Inspection
X-Ray Inspection is a non-destructive method of welding inspection. This method is used to see the underside and inside of welded materials. It is recorded on radiographic films and gives a comprehensible reading in order to know how durable the welded materials are.
3) Ultrasonic Inspection
Ultrasonic Inspection is a non-destructive method through which sound wave frequency is analysed to test for proper echoing within welded pipes. Any abnormalities in the sound wave frequency is tracked in order to reject any welds.
On the part of the welding inspector, the individual must be in possession of a wide array of knowledge such as welding drawings, symbols, procedures, joint weld design, inspection and testing techniques, etc.
Therefore, the welding inspector is required to be formally qualified. In order to gain the certification of a welding inspector, you must pass a welding inspection exam.