Thebutt welds joining together after forming the head

　　According to the practical experience, the stress attenuation length is greater than 3 g, and not less than 100 mm). But refrigeration equipment is difficult to meet the requirements, has its particularity.

　　Thebutt welds joining together after forming the head, should be 100% rays or ultrasonic testing, the qualified level with the equipment shell. Finally forming the same welding seam detection level, scale and equipment shell, high waste.Half spherical head Example: if the shell is 20% testing equipment, qualified III. The straight stitching and final weld, III qualify, welded joint coefficient is 0.85;

　　If the equipment shell is 100% inspection, II qualification. The straight stitching and final weld is unqualified, II welding joint coefficient So straight stitching, although 100% inspection, qualified level, along with the housing.But must pay attention to the process manufacturing process:

　　The correct way is: blanking (line) - small plate together into a big board - molding - nondestructive testingIf it's wrong to do testing before molding, guarantee the forming after the quality of the products. That is nondestructive testing refers to the nondestructive testing.

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