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Welding method for manufacturing jet pump by using ultra-low carbon austenitic stainless steel

A technology of carbon austenite and welding method, which is applied in the field of welding of ultra-low carbon austenitic stainless steel to make jet pumps, to achieve the effects of avoiding intergranular corrosion, controlling overall deformation and prolonging service life

Inactive Publication Date: 2011-10-26
唐山三友集团兴达化纤有限公司
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Problems solved by technology

[0003] The purpose of the present invention is to solve many deficiencies in the prior art, to provide a welding and cold water cooling at the same time, without heat treatment after welding, so as to avoid interatomic conversion of the internal properties and structure of stainless steel, and reduce hot cracks and intergranular corrosion after welding , overall deformation and other welding defects, greatly prolonging the service life of welded parts made of ultra-low carbon austenitic stainless steel

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  • Welding method for manufacturing jet pump by using ultra-low carbon austenitic stainless steel
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  • Welding method for manufacturing jet pump by using ultra-low carbon austenitic stainless steel

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Embodiment Construction

[0009] The present invention will be further described below in conjunction with the accompanying drawings.

[0010] This embodiment is a welding method for making a jet pump with ultra-low carbon austenitic stainless steel. Because the jet pump is a pipe body rolled by plates, and then welded by pipe body and pipe body fillet welds and flat welds, the welding method of the present invention is:

[0011] 1. Use manual tungsten argon arc welding, hand-held welding torch, welding and cooling water cooling at the same time, welding on one side, and cooling the weld with cold water on the other side, the water cannot directly contact the molten pool, the amount of cold water should be large, and the welding temperature should be low At 80°C, the welding speed is above 45-50cm / min, and the weld seam in contact with the corrosive medium is welded last. The temperature of the weldment drops to room temperature within 2 seconds after the arc is closed, and the thickness of the weldme...

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Abstract

The invention provides a welding method of an ultra-low carbon austenitic stainless steel and in particular relates to a welding method for manufacturing a jet pump by using an ultra-low carbon austenitic stainless steel. The method comprises the following steps: welding a weldment by means of a welding gun through manual tungsten electrode argon arc welding, wherein a welding wire made of a material same as the ultra-low carbon austenitic stainless steel is taken as a filler metal; carrying out welding and cold-water quick cooling simultaneously, wherein the temperature of welding is below 80 DEG C, and the speed of welding is 45-50 cm / min; after extinguishing the arc, cooling the weldment is reduced to the room temperature within 2 seconds, wherein the weldment is less than or equal to 12 mm thick; and after welding, carrying out pickling and passivation treatment. The welding method has the following outstanding advantages: the welding and cooling of the weld joint by virtue of cold water are carried out simultaneously, thus reducing the welding temperature, so that the stainless steel is free of transformation of internal molecules and atoms (crystals, therefore, the service life of the weldment is greatly prolonged; and the integrated deformation of the weldment is effectively controlled.

Description

technical field [0001] The invention relates to a welding method for ultra-low-carbon austenitic stainless steel, in particular to a welding method for making jet pumps with ultra-low-carbon austenitic stainless steel. Background technique [0002] Ultra-low carbon austenitic 00Cr20Ni25Mo5Cu2 stainless steel has been widely used in aviation, chemical, food and other industries with severe corrosion. Difficult, prone to brittle transition at 475°C, intergranular corrosion at 450-850°C, hot cracks and other serious welding defects, welding is not easy to master, this is still a technical difficulty in our country. In Tangshan Sanyou Group Xingda Chemical Fiber Co., Ltd., the weldment equipment made of this ultra-low carbon 00Cr20Ni25Mo5Cu2 austenitic stainless steel was previously introduced by Austrian Lenzing Company, which has the world's leading level of stainless steel welding technology. Among these equipment, the jet pump is the most prominent. Because the jet pump has...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/167B23K37/00B23K103/04
Inventor 孙林东肖立春韦吉伦付春东
Owner 唐山三友集团兴达化纤有限公司
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