In the production of stainless steel storage tanks, welding is a very important step, which is related to the product quality and use effect of the storage tank. The main supporting equipment of the sub-cylinder boiler is used to distribute the steam generated during the operation of the boiler to various pipelines. The sub-cylinder is a pressure-bearing equipment, which is a pressure vessel, and its pressure-bearing capacity and capacity should correspond to the supporting boiler. The main pressure components of the sub-cylinder are: head, shell material, etc. However, the problem of welding deformation often occurs in actual production, which is very difficult. Is there any way to control the welding deformation?
During the construction of the storage tank, due to the prefabrication accuracy, assembly error and thermal expansion and contraction during welding, the storage tank will be deformed to different degrees. This deformation is mainly welding deformation. Welding deformation is caused by the rapid expansion of the welded seam by high temperature heating, and then the shrinkage and bending of the welded joint caused by cooling.
The welding deformation of stainless steel can be controlled by using small line energy welding, reasonable arrangement of welding sequence, using the principle of anti-deformation, rigid fixing with fixtures, and hammering the welding seam with a small hammer after welding.
Precautions:
In the production of stainless steel storage tanks, the contamination that may cause carbonization of the weld metal should be cleaned up before welding. The main supporting equipment of the sub-cylinder boiler is used to distribute the steam generated during the operation of the boiler to various pipelines. The sub-cylinder is a pressure-bearing equipment, which is a pressure vessel, and its pressure-bearing capacity and capacity should correspond to the supporting boiler. 20mm on both sides of the weldment to be welded (including the bevel surface) should be cleaned, and there should be no grease, stains, paint marks, oxide scales and other impurities. It is usually scrubbed with dimethyl ketone or alcohol and then sanded. If the cleaning is not clean, these organic substances will decompose and burn into gas under the action of the high-temperature arc, causing the weld metal to generate pores and increase carbon, thereby reducing the corrosion resistance of the welded joint.
