Titanium/steel dissimilar metal plasma shunt melting electrode arc brazing device and method based on pulse coordination control

Abstract

The invention discloses a titanium / steel dissimilar metal plasma shunt melting electrode arc brazing device and method based on pulse coordination control. The device comprises a main welding power supply 1, a shunt power supply 8, a pulse coordination controller 13, a back-pull protection gas cover 2, a plasma shunt melting electrode welding gun 21, a wire feed mechanism 6, a current sensor 19 and the like. In the welding process, a pulse coordination control method is adopted, that is, when the main circuit current is a basic value, the shunt current is also a basic value, and the arc coupling stability in the welding process can be ensured; when the main circuit current is a peak value, the shunt current is also a peak value, the low workpiece heat input during welding can be ensured, and the stable and reliable welding process is realized. Brazed seams are protection by the back-pull protection gas cover in the welding process, and the problems of oxidizing, nitriding and the likein the high-temperature cooling process of the brazed seams are avoided.

Description

technical field [0001] The invention relates to the technical field of arc welding and brazing of dissimilar metals, in particular to a device and method for plasma shunting molten electrode arc brazing of titanium / steel dissimilar metals based on pulse coordination control. Background technique [0002] Titanium has high specific strength and high specific rigidity, good heat resistance to withstand high temperature, and good corrosion resistance. It is widely used in ships, aviation, aerospace, petrochemical and other fields. However, the high cost and poor processing performance of titanium alloy limit its further application in the industrial field. Steel is the most widely used metal material in industrial production. It has the advantages of low cost, high mechanical strength, good toughness, and excellent processing performance. In consideration of weight reduction, cost reduction and special performance, titanium and steel can be "utilized" and complement each other...

AI Technical Summary

Problems solved by technology

This method can realize the welding of titanium and steel in the atmospheric environment, and the welded joint after welding can withstand 1MPa air pressure, but there are still limitations: 99.95% silver wire solder can cause huge welding costs, which is not conducive to actual production economical requirements; the heat-affected zone produced by the arc welding process of argon arc welding is relatively large, and there will be more serious deformation problems after welding; only the molten pool protection during the welding process is used, and the titanium and brazed seams are cooled during the cooling process Prone to oxidation and nitriding

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