Dissimilar metal welding method for low-carbon steel and cast iron

A technology of dissimilar metals and welding methods, applied in welding equipment, laser welding equipment, metal processing equipment, etc., can solve the problems of increasing welding energy input, unfavorable welding deformation, increasing welding cost, etc., to reduce the tendency of weld cracking, Improve the effect of weld forming factor and weld width increase

Inactive Publication Date: 2019-09-17
CENT OF EXCELLENCE FOR ADVANCED MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, if welding wire is added during the laser welding process, the input of welding energy needs to be increased, which is unfavorable for

Method used

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  • Dissimilar metal welding method for low-carbon steel and cast iron
  • Dissimilar metal welding method for low-carbon steel and cast iron
  • Dissimilar metal welding method for low-carbon steel and cast iron

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Experimental program
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Effect test

Embodiment 1

[0035] A method for laser butt welding of dissimilar metals between low carbon steel and cast iron, comprising the steps of:

[0036] S1. Prepare the base metal: the carbon content of low carbon steel 1 is 0.07wt%, the carbon content of cast iron 2 is 2wt%, and the thickness of low carbon steel 1 and cast iron 2 is 1mm;

[0037] S2. Base metal surface cleaning and assembly: clean the base metal, remove oxides and oil stains on the surface, that is, clean oil stains, rust, etc. in the area to be welded, and assemble the surface-cleaned low-carbon steel 1 to be welded and cast iron 2 horizontally, Fix it with a tooling fixture to form the part to be welded. The assembly gap 4 of the butt joint between the low carbon steel 1 and the cast iron 2 is 0mm;

[0038] S3. Welding process: The connection of dissimilar metals between low carbon steel 1 and cast iron 2 adopts swing and offset self-fluxing welding process to weld the workpiece to be welded. The main welding parameters are: ...

Embodiment 2

[0042] A method for laser butt welding of dissimilar metals between low carbon steel and cast iron, comprising the steps of:

[0043] S1. Prepare the base metal: the carbon content of low carbon steel 1 is 0.3wt%, the carbon content of cast iron 2 is 2.5wt%, and the thickness of low carbon steel 1 and cast iron 2 are both 5mm;

[0044] S2. Base metal surface cleaning and assembly: clean the base metal, remove oxides and oil stains on the surface, that is, clean oil stains, rust, etc. in the area to be welded, and assemble the surface-cleaned low-carbon steel 1 to be welded and cast iron 2 horizontally, Fix it with a tooling fixture to form the part to be welded. The assembly gap 4 of the butt joint between the low carbon steel 1 and the cast iron 2 is 0.2mm;

[0045]S3. Welding process: The connection of dissimilar metals between low carbon steel 1 and cast iron 2 adopts swing and offset self-fluxing welding process to weld the workpiece to be welded. The main welding paramete...

Embodiment 3

[0049] A method for laser butt welding of dissimilar metals between low carbon steel and cast iron, comprising the steps of:

[0050] S1. Prepare base metal: low carbon steel 1 with a carbon content of 0.6wt%, low carbon steel 1 with a thickness of 8mm, cast iron 2 with a carbon content of 4wt%, and cast iron 2 with a thickness of 10mm;

[0051] S2. Base metal surface cleaning and assembly: clean the base metal, remove oxides and oil stains on the surface, that is, clean oil stains, rust, etc. in the area to be welded, and assemble the surface-cleaned low-carbon steel 1 to be welded and cast iron 2 horizontally, Fix it with a fixture to form the part to be welded. The assembly gap 4 of the butt joint between the low carbon steel 1 and the cast iron 2 is 0.5mm;

[0052] S3. Welding process: the connection of dissimilar metals between low carbon steel 1 and cast iron 2 adopts swing and offset self-fluxing welding process to weld the workpiece to be welded. The main welding param...

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Abstract

The invention discloses a dissimilar metal welding method for low-carbon steel and cast iron. The welding method comprises the following steps that S1, base materials are prepared, wherein the carbon content of the low-carbon steel is less than or equal to 0.6wt%, the carbon content of the cast iron is 2-4wt%, and the thickness of the low-carbon steel and the thickness of the cast iron are smaller than or equal to 10 mm; S2, surface cleaning and assembling of the base materials are carried out, wherein the base materials are cleaned so as to remove oxides and oil stains on the surface, horizontal butt joint assembly is carried out on the to-be-welded low-carbon steel and cast iron which are subjected to the surface cleaning, and a tool clamp is adopted for fixation to form a to-be-welded part, wherein the assembling clearance of the butt joint between the low-carbon steel and the cast iron is less than 20% of the thickness of the low-carbon steel and the cast iron; and S3, a welding process is carried out, wherein the dissimilar metal connection of the low-carbon steel and the cast iron adopts a swing and offset self-melting welding process to weld the to-be-welded part, the deviation of a laser incidence point to deviate towards the low-carbon steel side is the 35-45% of swing amplitude, so that the crack resistance of a weld joint is improved. According to the welding method, the welding cost can be reduced, and the crack resistance of the weld joint can be improved.

Description

technical field [0001] The invention relates to a connection technology of dissimilar materials, in particular to a method for welding dissimilar metals of low carbon steel and cast iron. Background technique [0002] Welding of mild steel and cast iron dissimilar metals often occurs in product structures such as automobiles and air-conditioning compressors. Since the carbon and impurity content in cast iron is generally high, it is very unfavorable for welding. When welding with low carbon steel dissimilar metals, welding cracks are easily generated. In order to avoid cracks in the weld seam, the welding method of filling low-carbon steel welding wire is mostly used at present, such as the connection between the low-carbon steel shell of the compressor and the cast iron pump body inside the shell, using MAG welding; in addition, for more important structures, also Austenitic welding consumables with better crack resistance are required. Due to the need to fill the welding...

Claims

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Application Information

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IPC IPC(8): B23K26/24B23K26/60B23K103/02
CPCB23K26/24B23K26/60B23K2103/02
Inventor 郑江鹏初铭强张书彦彭胜向明
Owner CENT OF EXCELLENCE FOR ADVANCED MATERIALS
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