Welding method of high-nickel alloy and stainless steel dissimilar metal

Abstract

The invention discloses a dissimilar intermetallic welding method for high nickel alloy and stainless steel, which adopts pulsed tungsten argon arc welding, and welding technological parameters comprise that: the background current is between 20 and 50A, the impulse current is between 28 and 60A, the impulse duration is between 5 and 10s, the impulse frequency is between 35 and 75Hz, the welding voltage is between 8 and 12V, the welding speed is between 1.0 and 2.6mm / s, the inert gas flow rate is between 5 and 12L / min, the distance between a nozzle of a welding torch and a workpiece is between 5 and 10mm, and the included angle between a tungsten electrode of the welding torch and a weldment is between 70 and 85DEG. The method adopted has the advantages of high welding efficiency, low cost and convenient and flexible operation, can obtain welding joints without defects of cracks, pores and the like, and can meet the use requirement of a heterogenous composite structure of high nickel casting alloy and austenitic stainless steel.

Description

technical field

[0001] The invention relates to a welding method between dissimilar metals, in particular to a welding method between a high-nickel alloy and stainless steel dissimilar metals, and belongs to the technical field of material welding. Background technique

[0002] With the development of contemporary science and technology, people put forward higher and higher requirements for the welding and joint performance of dissimilar metals. Especially when the composition and thickness of the two metal materials are very different, welding is more difficult. Therefore, the dissimilar metal welding process that can improve the comprehensive performance of products has attracted more and more attention.

[0003] For example, in response to the performance requirements of internal combustion engines and automobile engines, high-nickel alloys and austenitic stainless steels are welded to form a new type of aluminum piston with a wear-resistant inner cooling channel ring, w...