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Device and method for water-cooling hot wire argon tungsten-arc welding of austenitic stainless steel tube

A technology of austenitic stainless steel and argon tungsten arc welding, applied in arc welding equipment, welding equipment, welding accessories, etc., can solve the welding characteristics that cannot exert the high efficiency of mechanical hot wire tungsten argon arc welding, increase hot cracks and welding joint sensitization, uncontrollable interlayer temperature, etc., to achieve the effect of large linear expansion coefficient, prevention of intergranular corrosion, and slow height change

Active Publication Date: 2011-04-13
HARBIN BOILER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Hot wire tungsten argon arc welding can be used for austenitic stainless steel straight pipes to obtain a higher first pass rate and welding efficiency, but because mechanical welding is continuous welding , the interlayer temperature cannot be controlled, the heat input is relatively large, and the heat-affected zone is relatively wide, which increases the tendency to generate thermal cracks and weld sensitization. The test measurement results show that the welding interlayer temperature can reach above 500 °C
450-850°C is the sensitization temperature range of stainless steel materials. If the welded joint stays in this temperature range, intergranular corrosion will occur under a certain medium and stress, which will lead to premature failure of the welded joint.
[0003] If only by reducing the welding current, voltage, and welding heat input to control the tendency of sensitization and thermal cracks, the welding efficiency will be reduced and the High-efficiency welding characteristics of mechanical hot wire tungsten argon arc welding

Method used

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  • Device and method for water-cooling hot wire argon tungsten-arc welding of austenitic stainless steel tube
  • Device and method for water-cooling hot wire argon tungsten-arc welding of austenitic stainless steel tube

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Experimental program
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Effect test

Embodiment 1

[0025] The method of water-cooled hot wire tungsten argon arc welding of austenitic stainless steel tubes, firstly prepares before welding, adjusts the height and position of the welding torch, connects the straight austenitic stainless steel tubes and adjusts the position of the cooling water supply, and the gun of the welding equipment And adopt the same gas path protection, when the welding primer and the pipe is rotated to 270°, open the cooling water valve, and use the spray device to spray and cool the welded joint until all the primer, filling layer and cover layer are completed of welding.

Embodiment 2

[0027] In the water-cooled hot wire tungsten argon arc welding method for austenitic stainless steel tubes described in Example 1, the spray device includes nozzles with various apertures. When the diameter of the spray hole of the water-cooled nozzle is 0.5mm, select When the height of the nozzle relative to the workpiece is 30-50mm, the thickness of the single-layer weld is controlled below 1.5mm.

Embodiment 3

[0029] In the water-cooled hot wire tungsten argon arc welding method for austenitic stainless steel tubes described in embodiment 1 or 2, the position of the nozzle of the spray device is located directly below the welding port, and when the pipe diameter ranges from φ32mm to φ70mm, the The initial position of the nozzle above is 30mm from the lower surface of the pipe; during the welding process, the adjustment range in the up and down direction is 50mm, that is, the maximum distance between the upper surface of the nozzle and the lower surface of the pipe is 80mm. The direction adjustment range is ±50mm, facing the center of the weld seam; the axis of the nozzle is parallel to the axis of the pipe, and the water column sprayed by the nozzle is perpendicular to the surface of the pipe to ensure that the cooling water can be effectively sprayed to the weld joint Directly below.

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Abstract

The invention relates to a device and a method for a water-cooling hot wire argon tungsten-arc welding of an austenitic stainless steel tube. If the sensitization and tendency of generating hot cracks are controlled only by reducing welding current and welding voltage and reducing welding hot input, the welding efficiency is reduced, and the welding characteristic of high-efficiency mechanical hot wire argon tungsten-arc welding cannot be fully played. In the method for the water-cooling hot wire argon tungsten-arc welding of the austenitic stainless steel tube, the prewelding preparation is performed first, namely the height and position of a welding gun are adjusted, an austenitic stainless steel straight tube is subjected to butt joint, and the water supply position of cooling water is adjusted; the welding gun and wires of welding equipment are protected by the same gas course; and when welding priming coats and the tube rotate to the position of 270 degrees, a cooling water valve is opened, and a welding joint is subjected to spray cooling by a spraying device until all priming coats, filling layers and covering layers are welded completely. The device and the method are used for the argon arc welding of the austenitic stainless steel tube.

Description

Technical field: [0001] The invention relates to a device and method for using water-cooled hot wire tungsten argon arc welding in the welding process of austenitic stainless steel pipes. Background technique: [0002] The austenitic stainless steel straight pipe can be welded with hot wire tungsten argon arc welding to obtain a higher pass rate and welding efficiency, but because mechanical welding is continuous welding, the interlayer temperature cannot be controlled, the heat input is relatively large, and the heat-affected zone It is relatively wide, which increases the tendency to generate thermal cracks and sensitize the welded joints. The test measurement results show that the temperature between the welded layers can reach more than 500 °C. 450-850°C is the sensitization temperature range of stainless steel materials. If the welded joint stays in this temperature range, intergranular corrosion will occur under a certain medium and stress, which will lead to premature...

Claims

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Application Information

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IPC IPC(8): B23K9/16B23K9/235B23K9/32
Inventor 王萍李世魁李宜男张亚奇徐祥久李春光赵卫君
Owner HARBIN BOILER
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