Why are my spot welds not holding?
Why are my spot welds not holding?
Do not forget to maintain good water cooling of the electrodes. The most common causes are: Electrode force is too low: ensure that the force is suitable for the material being welded and that the squeeze time is sufficient to allow the set force to be reached before the weld current flows.
How do you test a spot welder?
One conventional method for inspecting spot-welds is to observe the welded metal cross-sectionally. Another is to drive a cold chisel in between spot-welded sheets to confirm whether the sheets will pry apart.
How do you spot a welding defect?
Common defects that can occur with spot welding include:
- Splattering of welded material caused by loose metal that was burned by the heat of the welder.
- Indentations or cracks in the metal.
- Asymmetrical spot weld marks.
How do I know if my weld is strong enough?
Welding Tests To really test a weld you need to do a x-ray test, magnaflux test, dye penetrant test or ultrasonic test which looks for voids, lack of fusion, etc.
What is carbon test in spot welding?
The program includes tensile test experiments to determine the spot weldability of carbon steel under two different modes of stresses. The test procedure includes the following. (1)A set of peel and lap specimens were welded under different welding condition (weld time and current). The electrode tip was 4 mm.
How does Spot welding work?
A form of resistance welding, spot welding is one of the oldest welding processes whereby two or more sheets of metal are welded together without the use of any filler material. The welding heat is generated by the electric current, which is transferred to the workpiece through copper alloy electrodes.
What is off time in spot welding?
Off Time. In Resistance Welding, Off Time denotes the amount of time in which the Electrodes open after the Welding Sequence and remain open prior to the welding sequence automatically repeating.
How does resistance spot welding work?