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Welding requirements and welding process for stainless steel tanks
May 29, 2018

As we all know, stainless steel storage tanks need to be welded, and the quality of tank welding can directly affect the life of the tank. Therefore, we must pay attention to the quality of its welding in the purchase of stainless steel tanks to ensure that it can buy high-quality stainless steel tanks.


In general, stainless steel tanks should have high tightness and strong corrosion resistance, which puts high requirements on the production technology and welding process of stainless steel tanks. There are many kinds of stainless steel welding processes, and each has a good welding quality. In the production of stainless steel storage tanks, more use is still argon arc welding, and are generally hand-welded.


In argon arc welding, we use small current, fast welding speed, short arc arc welding, and control the temperature between the layers to be controlled below 100 degrees. Of course, the welding materials used must also be matched; in order to avoid welding When hot cracking occurs, we must also pay attention to the selection of high-quality hydrogen electrodes with low carbon content. Fill the arc pits during welding, and we must slow the arc to form a crescent-shaped arc. In addition, the time interval for arc extinguishing must be well grasped. The next welding should be performed before the last arc point becomes dark red.


When welding the top plate of a large stainless steel storage tank and the angle of the bag edge, the major welds must be distributed symmetrically and uniformly, and the joints should be rejoined in the same direction. During the specific operation, the inside weld should be welded first, and the outside weld after the weld. The long weld in the radial direction should adopt the symmetry welding method of the partition and be retreated from the center to the outside.


The welding of the stainless steel tank tank wall is to weld the vertical weld first, and then weld the ring to the weld. After welding the longitudinal weld of the adjacent two rounds of the wall plate, weld the circumferential weld between them; the welder is evenly distributed, and Welding in the same direction. The welding of tack welds and work clamps shall be performed by qualified welders. Arcing shall not be on the base metal or on the finished weld pass.


Also, do not forget to check the quality of the assembly before welding the stainless steel tanks, remove rust, moisture, and dirt within 20 mm of both sides of the groove and bevel and dry them thoroughly. If the flaw depth or grinding depth exceeds 1mm, it should be repaired and smoothed.

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