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Welding process for inner exhaust coil pipe assembly

A technology of coil assembly and welding process, which is applied in the field of welding process of internal exhaust coil assembly, can solve the problems that the outer surface of the copper shell is easy to corrode, and the copper shell of the sensor is not tightly installed with the probe, so as to save solder and have a small width , easy-to-operate effect

Inactive Publication Date: 2019-08-27
TAIZHOU CHANGZHENG REFRIGERATOR PIPE FITTINGS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a sensor copper shell to solve the problem that the existing sensor copper shell is not tightly installed with the probe, and at the same time, the outer surface of the copper shell is easy to corrode when it penetrates into the liquid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A welding process for an internal exhaust coil assembly, comprising the following steps:

[0027] S1: Preparation, before welding, polish and derust the two annular inner exhaust coil welding outlets. After grinding and derusting, soak them in 15% hydrochloric acid for 3-5 minutes, then wash them with high-pressure water, and finally Drying is carried out by high-temperature nitrogen at 200-300°C; the flushing time of high-pressure water is 15-40s, and the drying time of high-temperature nitrogen is 2-4min. This step mainly pre-treats the parts to be welded, removes surface repairs, and then cleans them up.

[0028] S2: Material selection, choose 70N rolled welding wire; this step is relatively simple, choose suitable welding wire.

[0029] S3: spot welding, the two welded internal exhaust discs are brought close to each other with a distance of 1mm, and then high-temperature nitrogen gas of 600 degrees Celsius is introduced into the welded ports for 20 minutes to make...

Embodiment 2

[0036] A welding process for an internal exhaust coil assembly, comprising the following steps:

[0037] S1: Preparation, before welding, polish and derust the welding outlets of the two circular inner exhaust coils. After grinding and derusting, soak them in 15% hydrochloric acid for 4 minutes, then wash them with high-pressure water, and finally pass through 250 ℃ high-temperature nitrogen for drying; the flushing time of high-pressure water is 20s, and the drying time of high-temperature nitrogen is 3 minutes. This step mainly pre-treats the parts to be welded, removes surface repairs, and then cleans them up.

[0038] S2: Material selection, choose 70N rolled welding wire; this step is relatively simple, choose suitable welding wire.

[0039] S3: spot welding, the two welded internal exhaust discs are welded close to each other, the distance between them is 1.2mm, and then high-temperature nitrogen gas at 700 degrees Celsius is passed through the welded ports for 22 minut...

Embodiment 3

[0046] A welding process for an internal exhaust coil assembly, comprising the following steps:

[0047] S1: Preparation, before welding, polish and derust the welding outlets of the two circular inner exhaust coils. After grinding and derusting, soak them in 15% hydrochloric acid for 5 minutes, then wash them with high-pressure water, and finally pass through 300 ℃ high-temperature nitrogen for drying; the flushing time of high-pressure water is 40s, and the drying time of high-temperature nitrogen is 4min. This step mainly pre-treats the parts to be welded, removes surface repairs, and then cleans them up.

[0048] S2: Material selection, choose 70N rolled welding wire; this step is relatively simple, choose suitable welding wire.

[0049] S3: spot welding, put the two welded inner exhaust discs close to each other, the distance between the two is 1.5mm, and then inject high-temperature nitrogen gas at 800 degrees Celsius at the welding port for 25 minutes, so that the two ...

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Abstract

The invention relates to a welding process for an inner exhaust coil pipe assembly. The welding process comprises the following steps of S1, preparing, wherein grinding and rusting are carried out onthe positions of two annular inner exhaust coil pipe welding openings before welding; S2, selecting, wherein a 70N rolling welding stick is selected; S3, spot welding, S4, adding of an inner filling material, wherein after cooling is carried out, circular inner tubes are plugged into the inner walls of the two annular inner exhaust coil pipe welding openings, and the diameter of the inner tubes issmaller than the diameter of inner exhaust coil pipes by 1 mm; S5, welding, wherein the two ends of each of the two inner exhaust coil pipes are clamped through external clamps, then rotation is carried out at the speed being 1 r / min, and electric welding is used for welding the welding openings; S6, cooling, wherein normal temperature nitrogen at 20 DEG C-30 DEG C is continuously introduced, cooling is carried out, and the inner filling material is taken out; S7, grinding, wherein a grinding machine is used for grinding the positions of the welding openings to make the welding positions smooth; and S8, anti-corrosion treatment, wherein the welding positions are plated with a metal chromium layer. The method is easy to operate, high in process adaptability and capable of conveniently welding the exhaust coil pipes.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a welding process for an internal exhaust coil assembly. Background technique [0002] The internal exhaust coil assembly is a pipe for the internal combustion engine to discharge exhaust gas, and the internal exhaust coil assembly of the internal combustion engine is generally in a curved shape. And because the internal exhaust coil components are all round tubes, and the materials are all circular hollow tubes with high temperature resistance and a certain wall thickness, it is obviously impossible to shape them at one time by bending, which will cause other problems. Structural damage affects the exhaust. The general practice is to cut it into a specific shape, and then weld its connection to make it welded. The inner exhaust coil assembly can be manufactured into the required shape, while the existing The advanced welding process, after welding, the welding lines are larger...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B23K31/02B23K101/06
CPCB23K31/02B23K2101/06B23P15/00
Inventor 孙少杰
Owner TAIZHOU CHANGZHENG REFRIGERATOR PIPE FITTINGS
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