The quality control of steel saw pipe before welding is as follows:
1) First of all, the raw materials with good quality can not enter the construction site formally until they pass the inspection, and the use of unqualified steel products will be firmly eliminated.
2) The second is the management of welding materials. Check whether the welding material is qualified, whether the product, storage and baking system is implemented, whether the welding surface is clean and rustless, the electrode coating is intact, and whether there is mildew.
3) Third, clean welding zone management. Clean QA welding zone, no water, oil, rust and fouling oxide film, which is an important role in preventing external welding defects.
4) The principle of welding and post-welding should be carried out before choosing suitable welding method.