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
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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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