Micro-plasma arc welding for heat-resistant casting alloy and austenitic stainless steel

A technology of austenitic stainless steel and casting alloys, which is applied in rapid welding process, welding of pipe fittings, ion arc welding, and thin plates, and can solve the problems of different linear expansion coefficients, great difficulty, and great differences in thermophysical properties.

Inactive Publication Date: 2010-07-14
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the great difference in the structure and thermal physical properties of heat-resistant cast alloys and stainless steel, the weldability is poor, and there are many problems in welding, such as the different linear expansion coefficients of the two materials, which can easily cause thermal stress and cause cracks in the joint area; In particular, it is more difficult to weld thicker cast alloys with thin stainless steel (0.5mm ~ 1.0mm)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The heat-resistant cast alloy with a thickness of 12 mm and the stainless steel with a thickness of 0.8 mm were welded by micro-beam plasma arc welding. Heat-resistant cast alloy length 120mm, width 40mm, austenitic stainless steel length 120mm, width 60mm.

[0021] 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 15°C. Welding process parameters are: welding current 15A~20A, welding voltage 24V, welding speed 150cm / min~180cm / min; ion gas flow 0.45L / min~0.55L / min, shielding gas flow 8L / min~12L / min, ion Both gas and shielding gas use 99.999% high-purity argon. A cerium tungsten electrode with a diameter of 1.0 mm was used.

[0022] During the welding process, the workpiece remains still, the welding torch moves in a straight line, and the angle between the cerium-tungsten electrode of the welding torch and the horizontal plate of the weld is kept at an angl...

Embodiment 2

[0024] The austenitic stainless steel cylinder with a thickness of 0.6 mm and an inner diameter of 60 mm is welded to a heat-resistant cast alloy circular base plate with a thickness of 8 mm and a diameter of 60 mm by adopting the technology of the present invention. Before welding, use acetone or alcohol to clean the two base metals to be welded to remove oil stains, clamp the workpiece to be welded with a jig and adjust the position, and the welding can be carried out.

[0025] Under the condition of an ambient temperature of 20°C, the rotary tooling is used for direct welding, the micro-beam plasma arc welding torch remains stationary, and the workpiece is rotated to achieve welding. The welding process parameters are: welding current 12A~16A, welding voltage 24V, welding speed 220cm / min~260cm / min; ion gas flow 0.30L / min~0.45L / min, shielding gas flow 6L / min~11L / min, ion Both gas and shielding gas use 99.999% high-purity argon. A cerium tungsten electrode with a diameter of...

Embodiment 3

[0028] The chemical composition of the heat-resistant casting alloy is calculated by mass percentage: C 2%~3%, Si 1.0%~3.0%, Mn0.5%~1.5%, Cr≤2.5%, Ni 13%~18%, Cu 5% ~8%, S≤0.1%, P≤0.2%, and the rest is Fe; the tensile strength of the heat-resistant cast alloy is ≥170MPa, the bending strength is ≥388MPa, the hardness is 120~160HBS; the plate thickness is 12mm.

[0029] The chemical composition of austenitic stainless steel in terms of mass percentage is: C≤0.12%, Si≤1.0%, Mn≤2.0%, Cr 17%~19%, Ni 8%~10%, S≤0.03%, P≤0.035 %, Ti 5×(C%0.02)-0.8%, and the rest is Fe; the yield strength of austenitic stainless steel is ≥206MPa, the tensile strength is ≥520MPa, the elongation is ≥40%, and the hardness is ≤87HBS; the plate thickness is 1.0mm.

[0030] (1) Before welding, use a mass percentage of 8% to 12% NaCO 3 The solution cleans the surface of the joint between the heat-resistant casting alloy and the austenitic stainless steel workpiece to remove the oil stain or rust on the surfa...

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Abstract

The invention discloses a micro-plasma arc welding method for dissimilar metals of a heat-resistant casting alloy and austenitic steel, which realizes rapid welding of the heat-resistant casting alloy and the austenitic steel by adopting micro-plasma arc welding technology and proper process equipment, and strictly controlling welding process parameters, and is particularly suitable for the places where the thickness difference between the heat-resistant casting alloy and the stainless steel is great. Due to the micro-plasma arc welding method for the heat-resistant casting alloy and the austenitic stainless steel, the application range of heterogeneous structural parts of the heat-resistant casting alloy and the austenitic stainless steel is enlarged, and the micro-plasma arc welding method has the advantages of effectively improving the welding production efficiency, along with stable and reliable welding quality. Compared with the argon tungsten-arc process, the production efficiency of the micro-plasma arc welding is improved by more than 2 times.

Description

technical field [0001] The invention relates to a rapid welding process of a heat-resistant casting alloy and austenitic stainless steel, in particular to a micro-beam plasma arc welding method of a heat-resistant casting alloy and austenitic steel dissimilar metals, which is especially suitable for welding thin plates and pipe fittings. It belongs to the technical field of material welding. Background technique [0002] The heat-resistant alloy described in the present invention is cast by adding Ni and Cr alloy elements, has good thermal shock resistance, creep resistance, high temperature oxidation resistance and corrosion resistance, and is widely used in chemical equipment, engines, compression Machines and other mechanical structural parts. Because this heat-resistant alloy has good impact resistance and wear resistance at room temperature and high temperature, the dissimilar metal structure formed by welding with austenitic stainless steel expands its application ran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K10/02
Inventor 李亚江王娟吴娜
Owner SHANDONG UNIV
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