Welding method of oxide strengthened dispersion alloy shockproof screen part

Abstract

The invention relates to the technical field of alloy welding, in particular to a welding method of an oxide strengthened dispersion alloy shockproof screen part. The method comprises the following steps: firstly, the welding surface of a shockproof screen part is subject to sand papering, is cleaned by chemically pure acetone, is spot-welded and positioned at two ends of a welding seam after being dried at a room temperature, and finally is welded, the welding parameter is that 0.13 to 0.24 MPa of pressure is applied to the welding surface per 0.02 seconds, the power-on welding time is 0.16 s, the welding current is 6600 to 8000 A, the welding voltage is 209 to 213 V, the flow passage ratio is 7:10, and the welding speed is 0.4 m/s. The tensile-strength of the welding surface of the oxide strengthened dispersion alloy shockproof screen welded by the welding method reaches more than 65 % of that of an MGH 956 alloy body at a temperature of 1100 DEG C, so that the design requirement of an engine is met. The welding method is simple to operate, achieves the engineered production, is popularized and applied in other military plans, civil aircrafts and combustion engines, and has wide application prospect.

Description

technical field [0001] The invention relates to the technical field of alloy welding, in particular to a welding method for an oxide dispersion strengthened alloy shockproof screen part. Background technique [0002] The anti-shock screen parts made of MGH956 alloy plate for a new type of aero-engine need to be connected. Due to the strengthening phase Y of MGH956 alloy 2 o 3 The metallurgical incompatibility between nanoparticles and FeCrAl metal matrix leads to poor welding performance of such materials. For example, fusion welding methods such as argon arc welding, electron beam welding, and laser welding are likely to cause Y 2 o 3 Nanoparticles aggregate into oxide inclusions, even pores and cracks; and due to the Y 2 o 3 Nanoparticle aggregation can lead to a significant decrease in the high-temperature strength of fusion welded joints. Similarly, the more advanced TLP diffusion welding method is not suitable for the welding of MGH956 alloy. The reason is that th...

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Problems solved by technology

Due to the strengthening phase Y of MGH956 alloy 2 o 3 The metallurgical incompatibility between nanoparticles and FeCrAl metal matrix leads to poor welding performance of such materials. For example, fusion welding methods such as argon arc welding, electron beam welding, and laser welding are likely to cause Y 2 o 3 Nanoparticles aggregate into oxide inclusions, even pores and cracks; and due to the Y 2 o 3 Agglomeration of nanoparticles leads to significant loss of high temperature strength of fusion welded joints

Similarly, the more advanced TLP diffusion welding method is not suitable for the welding of MGH956 alloy, because the gas content of MGH956 alloy is high, and when the TLP diffusion welding gap is large, defects such as oxide inclusions, holes, and non-welding are prone to occur.