the welding seam into spiral

Spiral submerged arc welding pipe ( SSAW ) metal strip coil path when the forming Angle with the center line of the pipe forming (adjustable), forming and welding, the welding seam into spiral, advantage is that the identical specs of the steel strip can produce varied specifications of the steel tube diameter, uncooked materials vary is bigger, the weld can avoid the principal stress, 2.5 inch stainless steel pipe the stress situation is sweet, the disadvantage is that poor geometry dimension, weld size compared with straight seam size, simple to provide cracks, porosity, slag, weld defects corresponding to welding, welding stress is tensile stress state.

This is completely different from the idea that galvanized steel are just coated by zinc; in reality, zinc turns into a part of the steel. Because the strip edge bite, always partial lack of meat, so that the strip within the welding easy to crack, crack and affect the stability of the weld high quality. For example for deep drawing of sheets of steel, the tool referred to as rollers would be the best choice, as an alternative if the software known as press-brake is used for this function the desired end result cannot be attained.