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Welding method and welding device for nickel-based alloy pipe

A nickel-based alloy and welding device technology, which is applied in the field of welding production of nickel alloy pipes, can solve problems such as small pipe diameter, influence of pipe bending process, and influence on the mechanical properties of the weld, so as to achieve stable weld quality and avoid welding Unstable quality and good welding seam welding quality

Active Publication Date: 2022-05-24
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 welding device for nickel-based alloy pipe
  • Welding method and welding device for nickel-based alloy pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The Inconel 601 nickel alloy tube is made by the method proposed in the present invention, the wall thickness is 4mm, the outer diameter is about 185mm, and the length is 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, and use anhydrous ethanol to wipe the 20mm area near the weld of the pipe after rolling the pipe to remove oil pollution;

[0031] (2) Clamping: Fix the pipe to be welded on the welding mold and fixture 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;

[0032](3) Evacuation: Close and seal the vacuum chamber, use a mechanical vacuum pump, evacuate to belo...

Embodiment 2

[0038] The Inconel 601 nickel alloy tube is made by the method proposed in the present invention, the wall thickness is 3mm, the outer diameter is about 183mm, and the length is 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, and use anhydrous ethanol to wipe the 20mm area near the weld of the pipe after rolling the pipe to remove oil pollution;

[0040] (2) Clamping: Fix the pipe to be welded on the welding mold and fixture 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;

[0041] (3) Evacuation: Close and seal the vacuum chamber, use a mechanical vacuum pump, evacuate to bel...

Embodiment 3

[0047] The Inconel 625 nickel alloy tube is made by the method proposed in the present invention, the wall thickness is 5mm, the outer diameter is about 187mm, and the length is 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, and use anhydrous ethanol to wipe the 20mm area near the weld of the pipe after rolling the pipe to remove oil pollution;

[0049] (2) Clamping: Fix the pipe to be welded on the welding mold and fixture 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) Evacuation: Close and seal the vacuum chamber, use a mechanical vacuum pump, evacuate to bel...

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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 a welding device for nickel-based alloy pipes that effectively improve weld formation, reduce incomplete penetration of welds, undercut defects, and size deviations, and include the following steps: a. Preparation before welding: Mechanical grinding to remove oxides on the end face of the nickel-based alloy plate and the area near the edge to be welded; b. Clamping: Fix the pipe to be welded on the inner tube and the outer clamp in the vacuum chamber, and at the same time ensure that The welding seam is aligned with the light-transmitting glass window of the vacuum chamber; c, vacuuming; d, welding parameter setting: plan the laser welding path and set the laser welding process parameters; e, welding: the laser welds through the glass on the top of the vacuum chamber; f, Inflate, open the furnace door, take out the parts, and complete the welding operation. The invention is especially suitable for the welding production process of nickel-based alloy pipes.

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 coil-welding (longitudinal seam welding). These pipes are widely used in energy, chemical, 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 by argon arc welding method, plasma welding method, high frequency welded pipe method, etc., welding process difficulties are often encountered, including weld cracks, undercuts and Not fused, out of tolerance in shape and size, etc. Among them, cracks are a common problem in nickel-based alloy welding, which is related to...

Claims

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Application Information

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Patent Type & Authority Patents(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