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Ultrasonic peening assisted argon arc welding repair method for martensitic stainless steel engine casing

A technology of martensitic stainless steel and engine case, applied in arc welding equipment, welding equipment, welding/welding/cutting items, etc., can solve problems such as case scrapping, penetrating fatigue cracks, welding cracks, etc., and avoid welding The effect of preheating, reducing cracking tendency, and relieving welding stress

Active Publication Date: 2017-12-22
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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Problems solved by technology

[0002] When a certain type of engine was refurbished, it was found that penetrating fatigue cracks were prone to appear near the welding seam between the upper connecting pipe and the outer wall of the martensitic stainless steel engine casing. The surface of the heat-affected zone is prone to new welding cracks, which will lead to the scrapping of the casing
Therefore, in order to solve the problem that a single argon arc welding repair can easily cause welding cracks, it is urgent to seek or invent a new repair technology for martensitic stainless steel engine casings

Method used

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Examples

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Effect test

specific example 1

[0026] Using ultrasonic impact assisted argon arc welding technology to repair the penetrating crack defect of the martensitic stainless steel intermediate casing of a certain type of engine

[0027] 1. Confirmation of cracks in the intermediate casing

[0028] The intermediate case of a certain type of engine is made of 1Cr12Ni3Mo2Co2V martensitic stainless steel. When the case was refurbished, it was found that there was a 1 / 2 annular penetrating crack in the base near the installation edge of the connecting pipe and the annular weld of the outer wall, with a length of about 50mm.

[0029] 2. Repair process and inspection

[0030] (1) Select Φ1.0mm H1Cr12Ni3Mo2Co2VN stainless steel welding wire with the same composition as the casing material;

[0031] (2) Surface cleaning before repair. Under fluorescent light, use a hand-held electric gun to polish and remove crack defects. Visual inspection shows no fluorescence. The width of the semi-arc gap is about 2mm and the length...

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Abstract

The invention relates to an ultrasonic peening assisted argon arc welding repair method for a martensitic stainless steel engine casing and belongs to the technical field of argon arc welding repair. Accoriding to the ultrasonic peening assisted argon arc welding repair method, in the early stage, the same base material welding wire is adopted for conducting argon arc welding repair and ultrasonic peening assisted argon arc welding repair tests on a 1Cr12Ni3Mo2Co2V martensitic stainless steel test plate, and the room-temperature tensile and impact toughness properties of a Z1Cr12Ni3Mo2Co2V martensitic stainless steel base material and two kinds of repair connectors are tested correspondingly. Test results shows that the average ductility of the sample repaired through ultrasonic peening assisted argon arc welding is 1.25 times that of the sample directly repaired through argon arc welding, and the impact toughness is improved by almost 35%. Therefore, martensitic stainless steel is repaired through ultrasonic peening assisted argon arc welding technology, the impact toughness and room-temperature plasticity of the connectors can be improved significantly, the recracking tendency in the service process can be reduced beneficially, and thus the service life after repair is prolonged.

Description

technical field [0001] The invention relates to a method for repairing a martensitic stainless steel engine case by ultrasonic impact assisted argon arc welding, which belongs to the technical field of argon arc welding repair and is mainly used for repairing a martensitic stainless steel engine case. Background technique [0002] When a certain type of engine was refurbished, it was found that penetrating fatigue cracks were prone to appear near the welding seam between the upper connecting pipe and the outer wall of the martensitic stainless steel engine casing. The surface of the heat-affected zone is prone to new welding cracks, which will lead to the scrapping of the casing. Therefore, in order to solve the problem that a single argon arc welding repair can easily cause welding cracks, it is urgent to seek or invent a new martensitic stainless steel engine casing repair technology. Contents of the invention [0003] The invention designs and provides a method for rep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P6/04B23K9/16B23K103/04
CPCB23K9/16B23K2103/05B23P6/04
Inventor 孙兵兵秦仁耀周标李能郭绍庆张学军
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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