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Welding method and device for nickel-based alloy pipe

A technology of nickel-based alloys and welding methods, which is applied in welding equipment, laser welding equipment, metal processing equipment, etc., can solve problems such as the influence of pipe bending process, small pipe diameter, and influence on the mechanical properties of welds, so as to avoid poor welding quality Stable, weld seam welding quality and stable, good weld seam welding quality effect

Active Publication Date: 2021-08-17
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The repair welding operation brings many problems: the pipe diameter is small, and the inner surface of the weld seam is very difficult to repair welding in the pipe; additional materials are consumed (the original welding method does not require welding materials, but welding wire is required for repair welding) and manpower; the weld seam surface of the pipe is raised , and the protrusion not only has stress concentration, which affects the mechanical properties of the weld, but also affects the subsequent pipe bending process, so that the pipe bending mold must be grooved to avoid it, and if it is ground, it will be difficult to grind inside the pipe
The shape and size are out of tolerance, which brings great difficulties to the subsequent assembly and welding of pipes

Method used

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  • Welding method and device for nickel-based alloy pipe
  • Welding method and device for nickel-based alloy pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Adopt the method that the present invention proposes to make Inconel 601 nickel alloy tube, wall thickness 4mm, outer diameter about 185mm, length 1500mm. The manufacturing process includes the following procedures:

[0030] (1) Preparation before welding: Use an angle grinder and a stainless steel wire wheel to grind the surface oxides on the end face of the alloy plate and the area near the edge to be welded. After rolling the pipe, use absolute ethanol to wipe the 20mm area near the weld of the pipe to remove oil stains;

[0031] (2) Clamping: Fix the pipe to be welded on the welding mold and jig in the vacuum chamber, so that the two surfaces to be welded are closely attached, and the gap is less than 0.1mm. At the same time, ensure that the weld seam is aligned with the silica glass window on the top of the vacuum chamber;

[0032](3) Vacuuming: close and seal the vacuum chamber, use a mechanical vacuum pump to evacuate to below 10Pa, close the pumping valve, feed...

Embodiment 2

[0038] Adopt the method that the present invention proposes to make Inconel 601 nickel alloy tube, wall thickness 3mm, outer diameter about 183mm, length 1500mm. The manufacturing process includes the following procedures:

[0039] (1) Preparation before welding: Use an angle grinder and a stainless steel wire wheel to grind the surface oxides on the end face of the alloy plate and the area near the edge to be welded. After rolling the pipe, use absolute ethanol to wipe the 20mm area near the weld of the pipe to remove oil stains;

[0040] (2) Clamping: Fix the pipe to be welded on the welding mold and jig in the vacuum chamber, so that the two surfaces to be welded are closely attached, and the gap is less than 0.1mm. At the same time, ensure that the weld seam is aligned with the silica glass window on the top of the vacuum chamber;

[0041] (3) Vacuuming: close and seal the vacuum chamber, use a mechanical vacuum pump to evacuate to below 10Pa, close the pumping valve, fee...

Embodiment 3

[0047] Adopt the method that the present invention proposes to make Inconel 625 nickel alloy tube, wall thickness 5mm, outer diameter about 187mm, length 1000mm. The manufacturing process includes the following procedures:

[0048] (1) Preparation before welding: Use an angle grinder and a stainless steel wire wheel to grind the surface oxides on the end face of the alloy plate and the area near the edge to be welded. After rolling the pipe, use absolute ethanol to wipe the 20mm area near the weld of the pipe to remove oil stains;

[0049] (2) Clamping: Fix the pipe to be welded on the welding mold and jig in the vacuum chamber, so that the two surfaces to be welded are closely attached, and the gap is less than 0.1mm. At the same time, ensure that the welding seam is aligned with the silica glass window on the top of the vacuum chamber;

[0050] (3) Vacuuming: close and seal the vacuum chamber, use a mechanical vacuum pump to evacuate to below 10Pa, close the pumping valve, ...

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Abstract

The invention relates to the field of welding production of nickel alloy pipes, in particular to a welding method and device for a nickel-based alloy pipe, and the welding method and device can effectively improve welding seam forming and reduce incomplete penetration of welding seams, undercut defects and dimensional deviation. The method the following steps: a, preparation before welding: mechanically polishing to remove oxides on the end surface of a nickel-based alloy plate and the surface of an area near a to-be-welded edge; b, clamping: fixing a to-be-welded on an in-pipe clamping fixture and an out-pipe clamping fixture in a vacuum chamber, and simultaneously ensuring that a welding seam is aligned with a light-transmitting glass window of the vacuum chamber; c, vacuumizing; d, welding parameter setting, wherein a laser welding path is planned, and laser welding process parameters are set; e, welding: laser penetrates through the glass at the top of the vacuum cavity for welding; and f, inflating, opening a furnace door, taking a piece, and completing the welding operation. The welding method and device are particularly suitable for the welding production process of the nickel-based alloy pipe.

Description

technical field [0001] The invention relates to the field of welding production of nickel alloy pipes, in particular to a welding method and a welding device for nickel-based alloy pipes. Background technique [0002] In industrial production, nickel-based alloy sheets are commonly used to make pipes by coiling-welding (longitudinal seam welding) method. These pipes are widely used in energy, chemical industry, metallurgy and other fields. For example, continuous annealing furnaces in the metallurgical industry use nickel alloys to make radiant tubes. Because the weldability of nickel alloy is poorer than that of ordinary carbon steel, in production practice, when welding with argon arc welding, plasma welding, high-frequency pipe welding, etc., welding process problems are often encountered, including weld cracks, undercuts and Unfused, out-of-tolerance shape and size, etc. Among them, cracks are a common problem in the welding of nickel-based alloys, which are related t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/02B23K26/12B23K26/21B23K26/60
CPCB23K26/02B23K26/12B23K26/1224B23K26/123B23K26/21B23K26/60
Inventor 刘正林唐新新王泽龙
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD