4, Breaking load.

1) links and accessories with stud anchor chains should not show signs of breakage under the breaking load specified in Table 12.

2) Links and accessories of the studless anchor chain should not show signs of breakage under the breaking load specified in Table 13.

3) Proof load.

The permanent elongation of each section of the stud anchor chain under the tensile load specified in Table 12 shall not exceed 5% of the original length.

The permanent elongation of each section of the studless anchor chain under the tensile load specified in Table 13 shall not exceed 5% of the original length.

4) Quality.

a, The surface of the link and accessories should not have cracks, depressions, burrs and other defects; The link should not have cracks, unfused and dense pores on the welding head and its electrode clamping site.

b, The link should not have pores, overburn, cracks, unfused and other defects inside the welding head.

c, There should be no defects such as cracks, inclusions, shrink holes, etc. inside the accessories.

d, M3 and M4 grades of the geared link can be welded and reinforced after pressing, welding reinforcement should be limited to the end of the side of the horizontal gear opposite the link flash to the welding head, and the welded joint should not have cracks, porosity, inclusions and other defects. Generally, it should be welded in the circumferential direction of one end of the horizontal gear, if the welding quality can be guaranteed, it can also be welded at one end of the file below not less than 25% of the circumference length of the horizontal gear.