Dissimilar metal laser cladding welding method for copper pipe and steel pipe

A laser cladding, dissimilar metal technology, applied in laser welding equipment, welding equipment, metal processing equipment and other directions, can solve the problems of low strength, easy leakage, unstable quality of welded joints, etc., to achieve a small heat affected zone, increase The effect of improving absorption rate and efficiency

Active Publication Date: 2021-04-30
成都青石激光科技有限公司
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  • Summary
  • 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

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  • Dissimilar metal laser cladding welding method for copper pipe and steel pipe
  • Dissimilar metal laser cladding welding method for copper pipe and steel pipe
  • Dissimilar metal laser cladding welding method for copper pipe and steel pipe

Examples

Experimental program
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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 reflectivity t...

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] powder material Ni Ti Nb Cu Mo Cr Si Al Fe HR-Ni-S01 50 ~ 55 0.75 ~ 1.15 5 ~ 5.5 0.2 ~ 0.4 2.8 ~ 3.3 17 ~ 21 0.3 ~ 0.4 0.3 ~ 0.7 margin

[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 cladding welding method for copper pipes and steel pipes, which comprises the following steps: S1, grinding and cleaning the joint parts used for connecting the copper pipes and the steel pipes; S2, sending welding powder to into the powder baking furnace; S3. Coat the joints on the copper pipe with coating A; S4. Butt and assemble the parts where the copper pipe and the steel pipe need to be butted; S5. Preheat the butt joints of the copper pipe and the steel pipe; S6, Weld copper pipes and steel pipes with laser cladding equipment. Through the laser cladding welding in the invention, a welded joint with high welding strength can be obtained, the base material and the welding material are melt-metallurgically combined, and the combination is good. A layer of graphite coating is pre-coated on the copper pipe joint to reduce the strong reflection effect of copper on the laser, so that the welding part absorbs as much laser light as possible, and obtains enough energy to quickly melt the welding material and the base material. .

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 Patents(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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