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

A welding method and technology of dissimilar metals, applied in welding equipment, welding medium, welding equipment, etc., can solve the problem of low tensile strength of joints, achieve good welding effect, eliminate cracks and porosity, and high welding efficiency.

Inactive Publication Date: 2009-08-19
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Harbin Institute of Technology has used tungsten argon arc melting-brazing process to realize the connection of nickel-based alloy and stainless steel, but this method is strict to the positioning of the workpiece, and the tensile strength of the joint is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The high-nickel alloy plate with a thickness of 14 mm, a length of 140 mm, and a width of 80 mm was used for argon tungsten arc welding to an austenitic stainless steel sheet with a thickness of 0.6 mm.

[0022] Before welding, use acetone or alcohol to remove the oil stain on the surface of the workpiece joint, and perform welding directly at an ambient temperature above 10°C. The welding process parameters are: welding current 35A-48A, welding voltage 9-10V, welding speed 1.5mm / s-1.8mm / s, argon gas flow rate 6L / min, tungsten electrode diameter 2.0mm.

[0023] During the welding process, keep the angle between the tungsten electrode of the welding torch and the horizontal plate of the welding seam at an angle of 85°, the extension length of the tungsten electrode is 5mm, the arc at the tip of the tungsten electrode is always under the protection of argon gas, and the entire welding seam is continuously completed at one time. At the end of the straight seam welding, the...

Embodiment 2

[0025] The pulse tungsten argon arc welding method is used to perform pulse tungsten argon arc welding on the high-nickel alloy ring with a thickness of 12mm and a diameter of 150mm and a stainless steel clasp with a thickness of 0.6mm.

[0026] Before welding, use acetone or alcohol to remove the oil stain on the surface of the workpiece joint, and use the rotary tooling to weld directly at the ambient temperature of 24 °C. The welding process parameters are: base current 25A-45A, pulse current 34A-48A, pulse duration 6s-9s, welding voltage 9-10V, welding speed 1.4mm / s-1.7mm / s, argon gas flow 7L / min.

[0027] During the welding process, keep the tungsten electrode of the welding torch at an angle of 85° with the horizontal weld seam, the extension length of the tungsten electrode is 5mm, the arc at the tip of the tungsten electrode is always under argon protection, and the entire girth weld is completed continuously at one time. At the end of the circular seam welding, the ar...

Embodiment 3

[0029] The high-nickel alloy ring with a thickness of 14mm and a diameter of 220mm was welded to an austenitic stainless steel ring with a thickness of 0.8mm by pulse tungsten argon arc welding.

[0030] Before welding, use acetone or alcohol to remove the oil on the surface of the joint between the high-nickel alloy ring and the stainless steel ring, and use the rotary tooling to weld directly at an ambient temperature of 20°C. The welding process parameters are: welding current 42A~50A, pulse current 38A~48A, pulse duration 8s~12s, welding voltage 10-12V, welding speed 1.6mm / s~2.0mm / s, argon flow 8L / min, tungsten Pole diameter 2.0mm.

[0031] During the welding process, keep the angle between the tungsten electrode of the welding torch and the horizontal plane of the circular weld at 85°, the extension length of the tungsten electrode is 6mm, the arc at the tip of the tungsten electrode is always under argon protection, and the entire circular weld is completed continuously ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/167B23K9/09B23K9/095B23K9/235B23K35/04B23K9/02C22C38/58C22C38/40B23K103/18
Inventor 李亚江张永兰王娟
Owner SHANDONG UNIV
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