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Laser welding method for nodular cast iron and low-carbon steel

A nodular cast iron and laser welding technology, which is applied in laser welding equipment, welding equipment, welding/welding/cutting items, etc., can solve the problems of cracks and pores between ductile iron and low carbon steel

Active Publication Date: 2021-05-04
CHANGCHUN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a laser welding method for ductile iron and low carbon steel, which solves the problems of cracks and pores in the welding process of ductile iron and low carbon steel

Method used

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  • Laser welding method for nodular cast iron and low-carbon steel
  • Laser welding method for nodular cast iron and low-carbon steel
  • Laser welding method for nodular cast iron and low-carbon steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Step 1. Process the spheroidal graphite cast iron 450 and 20CrMnTi into samples of required specifications, polish the surface to be welded of spheroidal graphite cast iron 450 and 20CrMnTi smooth with sandpaper, then clean the surface of the sample with alcohol solution, and dry it;

[0054] Step 2: Apply light-absorbing paint on the surface of ductile iron 450 to be welded, wait for the light-absorbing paint to dry, and the thickness of the formed coating is 0.1-0.2mm; wherein, the preparation of the light-absorbing paint is: 50% C powder and 50% MoS 2 The powder is proportioned and diluted with absolute ethanol (99.5%) to prepare a light-absorbing coating; the surface to be welded with the light-absorbing coating is subjected to CO 2 Laser surface heat treatment, laser power 600W, scanning speed 200mm / min, positive defocusing amount 15mm, forming a 0.75mm thick degraphitized layer, and obtained a partially degraphitized ductile iron 450 on the surface; the degraphitiz...

Embodiment 2

[0060] Step 1. Process the spheroidal graphite cast iron 450 and 20CrMnTi into samples of required specifications, polish the surface to be welded of spheroidal graphite cast iron 450 and 20CrMnTi smooth with sandpaper, then clean the surface of the sample with alcohol solution, and dry it;

[0061] Step 2: Apply light-absorbing paint on the surface of ductile iron 450 to be welded, wait for the light-absorbing paint to dry, and the thickness of the formed coating is 0.1-0.2mm; wherein, the preparation of the light-absorbing paint is: 50% C powder and 50% MoS 2 The powder is proportioned and diluted with absolute ethanol (99.5%) to prepare a light-absorbing coating; the surface to be welded with the light-absorbing coating is subjected to CO 2 Laser surface heat treatment, laser power 600W, scanning speed 300mm / min, positive defocusing amount 25mm, forming a 0.3mm thick degraphitized layer, and obtained a partially degraphitized ductile iron 450 on the surface; the degraphitize...

Embodiment 3

[0067] Step 1. Process the spheroidal graphite cast iron 450 and 20CrMnTi into samples of required specifications, polish the surface to be welded of spheroidal graphite cast iron 450 and 20CrMnTi smooth with sandpaper, then clean the surface of the sample with alcohol solution, and dry it;

[0068] Step 2: Apply light-absorbing paint on the surface of ductile iron 450 to be welded, wait for the light-absorbing paint to dry, and the thickness of the formed coating is 0.1-0.2mm; wherein, the preparation of the light-absorbing paint is: 50% C powder and 50% MoS 2 The powder is proportioned and diluted with absolute ethanol (99.5%) to prepare a light-absorbing coating; the surface to be welded with the light-absorbing coating is subjected to CO 2 Laser surface heat treatment, laser power 700W, scanning speed 150mm / min, positive defocusing distance 5mm, forming a 0.9mm thick degraphitized layer, and obtained a partially degraphitized ductile iron 450 on the surface; the degraphitiz...

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Abstract

The invention provides a laser welding method for nodular cast iron and low-carbon steel, and belongs to the technical field of laser processing. Firstly, laser is used for conducting laser surface heat treatment on a to-be-welded surface of the nodular cast iron for degraphitization, most of graphite on the to-be-welded surface of the nodular cast iron is ablated into gas to overflow under the action of the laser, the other part of graphite is dissolved in the structure, and in the laser heat treatment process, the temperature gradient of a molten pool is very large, the great supercooling degree is formed, and the martensite generation condition is achieved. Along with generation of carbide, the graphite on the to-be-welded surface of the nodular cast iron is reduced, and the nodular cast iron with the locally-degraphitized surface is obtained. The de-graphitized surface is in butt joint with the to-be-welded surface of the low-carbon steel, then laser welding is carried out, air holes and crack defects of a welding joint in the laser welding process can be effectively avoided, and the strength of the welding joint is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of laser processing, in particular to a laser welding method for nodular cast iron and low-carbon steel. Background technique [0002] Ductile iron is about 10% lighter than steel, has no residual stress, and has fewer defects during processing. Moreover, ductile iron is superior to steel in terms of vibration damping, wear resistance, and sensitivity to notches, and has a huge advantage in price. It is used for As part of the combined ring gear. Steel as a gear part can be more conducive to carburizing and quenching to improve the strength, hardness and wear resistance of the gear, thereby increasing the life of the gear. Ductile iron is used as the combined ring gear part, and steel is used as the gear part. This method can effectively reduce costs and is in line with the future development direction of lightweight. Due to the presence of a large amount of graphite in ductile iron, a large amount of carb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/32B23K26/352B23K26/60B23K26/14B23K26/18
CPCB23K26/14B23K26/18B23K26/32B23K26/352B23K26/60B23K2103/04B23K2103/06
Inventor 石岩张培学刘佳
Owner CHANGCHUN UNIV OF SCI & TECH