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Stainless steel welding method

A welding method, stainless steel technology, applied in welding equipment, welding/welding/cutting items, arc welding equipment, etc., can solve the problem of reducing the N element of the weld pool

Active Publication Date: 2014-05-14
CRRC YANGTZE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is proposed to solve the defects existing in the prior art, and its purpose is to solve the problem of reducing the N element in the weld pool that is easy to occur when welding duplex stainless steel with molten pole solid inert gas shielded welding, and to more effectively ensure the welding seam Excellent strength and corrosion resistance, better control of weld appearance quality, and reduced welding spatter

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The welding method in this embodiment takes a butt weld with a plate thickness of 6 mm as an example.

[0018] First of all, the V-shaped groove is made on the butt weld, and the groove is designed to prepare for the subsequent welding process. It is used in conjunction with the subsequent welding process so that the technical solution of this embodiment can ensure the quality of welding when welding the stainless steel. The present invention finds creatively that under the environment of this embodiment, the groove angle is controlled at 60°±5°, the blunt edge of the groove is controlled between 0 mm and 2 mm, and the assembly gap is controlled between 0 mm and 2 mm. When the groove parameters between, the effect obtained after the method of the present invention is implemented is the best.

[0019] After opening the groove and before welding, clean up the oil, water and other impurities on the surface of the weld that affect the welding quality.

[0020] Then carry ...

Embodiment 2

[0030] The welding method in this embodiment takes a 6 mm fillet weld as an example.

[0031] First of all, before welding, clean up the oil, moisture and other impurities on the surface of the weld that affect the welding quality. Weld seam assembly is carried out, and the gap of the weld seam assembly is controlled between 0 mm and 1 mm.

[0032] Fillet welds are welded, and the back of the welds is blocked by shielding gas. The connection current is controlled at 170 amps to 180 amps, the welding voltage is controlled at 28 volts to 30 volts, the welding speed is controlled between 300 and 350 mm / min, and carbon dioxide with a content greater than 99.9% is used as the welding shielding gas, and the gas flow is controlled at 15-17 liters / min.

[0033] Preferably, E2209LT1-1 flux-cored stainless steel welding wire with a diameter of 1.2 mm is selected for the entire welding process, and Panasonic KRⅡ500 gas shielded welding machine is used for welding, and the polarity is r...

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Abstract

The invention relates to a stainless steel welding method. The method comprises the following steps that a V-shaped groove is formed in a butt welding seam; welding is carried out on a bottoming welding seam, carbon dioxide with content larger than 99.9% is used as protecting gas for welding, gas flow is controlled to be 15-17 liters per minute, and the protecting gas does not pass through the back of the welding seam; welding is carried out on a front groove cover face welding seam, the carbon dioxide with the content larger than 99.9% is used as the protecting gas for welding, and gas flow is controlled to be 15-17 liters per minute; welding is carried out on a back welding seam, the carbon dioxide with the content larger than 99.9% is used as the protecting gas for welding, and gas flow is controlled to be 15-17 liters per minute. As the carbon dioxide is used as the protecting gas, by means of the three-welding-seam process comprising the bottoming welding seam, the cover face welding seam and the back welding seam, the mechanical property and the corrosion resistance of the welding seams are effectively ensured, and the problem that the quality of appearance of the welding seams can not be controlled easily is solved.

Description

technical field [0001] The invention relates to the field of production and manufacture of duplex stainless steel, in particular to an economical duplex stainless steel welding method. Background technique [0002] Duplex stainless steel is an alloy material with ferrite and austenite as the body. It has high strength, good toughness, and strong corrosion resistance. The content of austenite and ferrite is roughly balanced. The application of duplex stainless steel in my country has entered a period of rapid development, and the application fields involve marine mining, building bridges, papermaking, food and other industries. Nowadays, most of the stainless steel body materials in the field of railway wagon manufacturing are ferritic stainless steel, and the economical duplex stainless steel has not been applied in the field of railway wagon manufacturing for the time being. The invention provides an economical duplex stainless steel welding method. The chemical compositi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/173B23K9/235B23K9/23B23K9/02
CPCB23K9/02B23K9/173B23K9/23B23K9/235B23K2101/18B23K2103/04
Inventor 冯存义武永亮江锐锋李加良左云清李践桥王利段志华郭文亮刘志强
Owner CRRC YANGTZE CO LTD
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