The square tube machine has two forming processes, namely "welding first, forming later" and "forming first, welding later".
First welding, then forming: first weld the welded pipe into a circle, and then change it into a square pipe. The advantage of this method is to reduce the processing of rolls, and it will be more convenient to change varieties.
First forming, then welding: square tubes are directly formed, and then welded. The advantages are: the number of square tube machine forming frames is increasing with the development of products. The deformation load of each part is balanced, and the disadvantage is that it will increase the use of rolls.
