1. Welding defects of straight seam submerged arc welded pipes1.1 Burn-throughBurn-through is a hole formed by the liquid molten pool metal flowing out from the back of the weld during welding. Burn-through often occurs during the welding of thin-walled welded pipes. Burn-through in the production p

1. Reasonable selection of milling process and parameters:Reasonable selection of milling process according to actual production conditions. Under the condition of ensuring production, try to use a single milling process and select an I-type groove, to reduce milling defects and make it easy to proc

1. Weld defects: The weld defects are serious, and manual mechanical grinding is used to compensate for them. The grinding marks produced cause uneven surfaces and affect the appearance. Pickling and passivation of the weld alone also cause uneven surfaces.2. Scratches are difficult to remove: Overa

The finished products of seamless steel pipes and precision steel pipes will have the problem of uneven eccentric thickness; but how is it produced? Many people don’t understand. Today, let’s talk about how the eccentricity of seamless steel pipes such as cold-drawn steel pipes, cold-rolled steel pi