Dissimilar metal laser fusion covering welding method for copper pipe and steel pipe

A technology of laser cladding and dissimilar metals, applied in laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of low strength, easy leakage, unstable quality of welded joints, etc., and achieve small heat-affected zone, increase Effect of absorption rate, efficiency improvement

Active Publication Date: 2019-12-17
成都青石激光科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a laser cladding welding method of dissimilar metals for copper pipes and steel pipes, which solves the problem of low strength, easy leakage, welding process and welding problems of existing welding parts between copper pipes and steel pipes. Unstable joint quality and other technical problems mentioned above

Method used

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  • Dissimilar metal laser fusion covering welding method for copper pipe and steel pipe
  • Dissimilar metal laser fusion covering welding method for copper pipe and steel pipe
  • Dissimilar metal laser fusion covering welding method for copper pipe and steel pipe

Examples

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Effect test

Embodiment 1

[0041] A dissimilar metal laser cladding welding method for copper pipes and steel pipes, comprising the following steps:

[0042] S1. Material preparation: Grind and clean the joints between the copper pipe and the steel pipe for connection;

[0043] S2. Send the welding powder into the powder drying furnace, and keep it warm for more than 3 hours at a temperature of 50 ° C ~ ~ 100 ° C;

[0044] S3. Coat the joints on the copper pipe with graphite coating; use graphite coating as an intermediate transition coating, and pre-coat a layer of graphite coating on the joints of copper pipes to reduce the intensity of copper to light The reflection effect increases the laser absorption rate of copper, so that in the subsequent laser cladding, the welding part receives the laser as much as possible, obtains enough energy, and quickly melts the welding material and the base material. In addition to graphite coating, powder coatings such as white iron and tin, which have lower reflect...

Embodiment 2

[0060] This embodiment is an implementation description of the welding parameters in step S6 in the first embodiment.

[0061] The welding process parameters are preferably: laser power 2.8-3.8KW, scanning speed 4-8mm / s, powder feeding volume 2.5-4.5g / min, spot diameter 2-3mm, shielding gas using argon, shielding gas flow 10- 20L / min. The model of laser cladding equipment is preferably METAL+1006, and its parameters during laser cladding are shown in Table 1:

[0062] Laser power (P) scanning speed Feeding volume Shielding gas flow Spot diameter 2.8-3.8KW 4~8mm / s 2.5-4.5g / min 10-20L / min 2-3mm

[0063] Table 1. Laser cladding process parameters

Embodiment 3

[0065] This example is a concrete description of the nickel-based alloy powder. Nickel-based alloy powder is preferably HR-Ni-S01 powder.

[0066] The composition of HR-Ni-S01 powder is recorded in mass percentage, as shown in the following table:

[0067]

[0068] Table 2. HR-Ni-S01 powder composition list

[0069] Due to the large difference in materials of copper pipes and steel pipes, the requirements for welding filler materials are relatively high. In the present invention, a nickel-based alloy powder with high content of Ni and Cr and good wettability with copper is selected as the welding material. Ni and Copper can melt infinitely, which improves the wettability, mutual melting and bonding between the weld and copper.

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Abstract

The invention discloses a dissimilar metal laser fusion covering welding method for a copper pipe and a steel pipe. The method comprises the following steps that S1, connector parts, for connection, on the copper pipe and the steel pipe are polished and completely cleaned; S2, welding powder is conveyed into a powder roasting furnace; S3, the connector part on the copper pipe is coated with a coating A; S3, the parts, needing to be in butt joint, of the copper pipe and the steel pipe are in butt joint assembly; S5, the butt joint parts of the copper pipe and the steel pipe are pre-heated; S6,laser fusion covering equipment is used for welding the copper pipe and the steel pipe. According to the method, through laser fusion covering welding, a welding connector with high welding strength can be obtained, fusion metallurgy combination of a parent material and a welding material is conducted, and the combination performance of the parent material and the welding material is good. The connector part of the copper pipe is coated with a graphite coating in advance, so that the strong reflection effect of copper on the laser is reduced, the welding part absorbs the laser as many as possible accordingly, the enough energy is obtained, and the welding material and a base material are quickly fused.

Description

technical field [0001] The invention relates to the field of laser welding of metal materials, in particular to a laser cladding welding method for dissimilar metals used for copper pipes and steel pipes. Background technique [0002] Copper and copper alloys are widely used in electrical, chemical, machinery manufacturing and other industries due to their excellent properties. At the same time, the demand for high-quality and efficient welding technology is becoming more and more intense. The welding between copper and steel dissimilar metals is the best One of the common welding needs. However, due to the excellent thermal conductivity of copper and the huge difference in physical and chemical properties from steel, conventional welding methods are difficult to achieve good welding results. [0003] Brazing is one of the commonly used welding methods in brazing. Brazing is to use a metal material with a lower melting point than the base metal as the solder, heat the weld...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/282B23K26/323B23K26/60B23K26/12B23K103/22
CPCB23K26/123B23K26/282B23K26/323B23K26/60B23K2103/22
Inventor 彭柏元熊凯周超阳义
Owner 成都青石激光科技有限公司
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