How to judge whether the welding quality of weld nuts is qualified?

1. Appearance inspection
The weld should be uniform and continuous, without obvious defects such as cracks, pores, slag inclusions, etc.
The joint between weld nuts and parent materials should have a smooth transition and no undercut phenomenon.
2. Dimension inspection
Measure the position, angle and height of weld nuts, which should meet the design requirements.
3. Strength test
Destructive tests such as tensile tests can be carried out to check whether the tensile strength of the weld reaches the specified value.
Non-destructive torque test, by applying the specified torque to check whether the nut can withstand it without loosening or falling off.
4. Sealing check
If used in a sealed structure, it is necessary to check the sealing of the weld to ensure that there is no leakage.
5. Non-destructive testing
Use non-destructive testing methods such as ultrasonic testing and magnetic particle testing to detect whether there are defects inside the weld.
6. Traceability
Check the process parameter records of the welding process, the qualifications of the operator, etc. to ensure that the welding process meets the specifications.
7. Actual use verification
During the actual assembly and use process, observe whether the weld nuts can perform the tightening function normally without looseness, deformation and other problems.