Spring is one of the important basic parts in mechanical products. There are many types of it. According to the shape, it is divided into: spiral spring, plate (leaf) spring, disc spring, ring spring, flat (truncated cone) spiral spring, etc.; according to the bearing characteristics: compression, tension, torsion spring, etc. . The stresses the spring bears mainly include: bending stress, torsion stress, tension and compression stress and compound stress. The main failure modes of springs are: fracture, deformation, relaxation, and wear. The main analysis is fracture and deformation (relaxation).
1. Brittle fracture: most of the spring fractures are brittle fractures. Only when the working temperature is high, plastic fracture may occur. In engineering, fatigue fracture, stress corrosion fracture and hydrogen embrittlement fracture are called brittle fracture
2. Fatigue fracture: the fracture of a spring under cyclic loading.
3. Stress corrosion fracture: the spring fracture phenomenon caused by the combined action of tensile stress and corrosive media.
4. Corrosion fatigue fracture: the fracture of the spring under the combined action of cyclic load and corrosive medium.
5. Hydrogen embrittlement, cadmium embrittlement, black embrittlement: brittle fracture caused by high impurity content in the spring material.
6. Wear: Wear is divided into: abrasive, fatigue and corrosion wear fracture.
When the spring is heated to a certain temperature, its elasticity will be affected, and even segregation will occur, which will easily break. Of course, as you said, the ground wire is relatively thin, and the spring may not be heated too much, and the temperature during welding will not be too high. High, so that it will not affect its elasticity and will not break. Furthermore, electrical sparks will be generated due to poor contact during welding. If the spring is not burnt, there will be no problem. If there is damage, it is still invalid.