Welding characteristics of stamping elbows
The stamping elbow has the characteristics of health, high temperature resistance and ultraviolet radiation resistance. It is a new material with high added value. Because the stamping elbow pipe has the advantages of smooth inner wall, small resistance of heat medium flow, acid and alkali resistance, long service life and easy installation. Welding features of stamping elbow:
1.In order to prevent the erosion between the eyes caused by heating, the welding current should not be too large, about 20% less than the carbon steel electrode, the arc should not be too long, the layer between the rapid cooling, narrow welding pass is appropriate.
2.Stamping elbow welding after the hardening of the larger, easy to produce cracks. If the same type of stamping elbow welding, it is necessary to carry out the preheating of more than 300℃ and the slow cooling treatment of about 700℃ after welding. If the welding part cannot be heat treated after welding, the stamping elbow electrode should be selected.
3.The metal ions separated from the workpiece and the phosphoric acid in the polishing fluid form a phosphate film which is adsorbed on the surface of the workpiece. This is a process in which the mucosa is thinner in the convex part and thicker in the concave part, and rapidly dissolves due to the high current density in the convex part. The workpiece is used as the anode to connect the positive pole of the dc power supply. Lead, stainless steel and other electrolyte corrosion-resistant conductive materials are used as the cathode to connect the negative electrode of the dc power supply. Both are a distance apart in the electrolyte (general with sulfuric acid, phosphoric acid as basic component), to a certain temperature, voltage, and current density (usually less than 1 / cm2), electricity time (generally for a few seconds to a few minutes), on the surface of a workpiece bumps on the tiny to dissolve, and gradually became smooth and shining surface.
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