How to solve the welding gap of stainless steel pipe

How to solve the welding gap of stainless steel pipe

Nov 25, 2019

           When the stainless steel pipe is welded, some welding gaps may occur. How to solve the problem of welding gap of stainless steel welded pipe? Let's understand.

           Stainless steel welded pipe welding is subject to temperature control. The welding temperature is generally affected by the high-frequency eddy current thermal power. According to the relevant formula, the high-frequency eddy current thermal power is generally affected by the current frequency, and the eddy current thermal power and current excitation frequency are squared. In direct proportion.

           For low carbon steel, the welding temperature can generally be controlled at 1150~1360 °C, which can meet the penetration requirements of pipe wall thickness of 2~4mm. In addition, the soldering temperature can also be achieved by adjusting the speed of the soldering.

           When the input heat is insufficient, the edge of the heated weld does not reach the temperature of the weld, and the metal structure may remain solid, forming unfused or not welded. When the input heat is insufficient, the edge of the heated weld will exceed the soldering temperature, resulting in over-fire or droplets, which will cause the weld to form a melt.

           The control of the pressing force, after the two edges of the tube are heated to the welding temperature, under the extrusion of the pressing roller, a common metal grain may be formed for mutual penetration and crystallization, thereby finally forming a firm weld.

           However, if the pressing force is too small, the number of common crystals formed will be small, and the strength of the weld metal will also decrease, so that cracking is likely to occur after being stressed. If the pressing force is too large, the molten metal may be extruded into the weld, which not only reduces the weld strength, but also may cause a large amount of internal and external burrs, which may cause defects such as welding seams and the like. .
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