Abstract military welding residual stress is present in the welding member can not be ignored, Haoke eliminate welding stress technique allows to eliminate welding stress becomes easier, convenient and thorough.
Welded components occupy an increasingly important position in military production, and the welding stress existing in welded components is a problem that cannot be ignored. It directly affects the bearing capacity, fatigue performance, corrosion resistance, etc. of the product, as a new stress-relieving Method ------ Howe can eliminate the application of welding stress equipment is of great significance to military production.
Hawker's ability to eliminate welding stress equipment has the following distinct technical advantages:
· It is the most complete process to eliminate residual tensile stress and produce ideal compressive stress (the different aging methods to eliminate residual stress are as follows: vibration aging 30~55%, thermal aging 35-80%, Hawker aging 80%) the above);
· It can increase the fatigue strength of welded joints by 50%-120% and prolong the fatigue life by more than 5 times;
· Directly process the residual height, pits, undercuts, etc. at the weld toe into a smooth transition, thereby effectively improving the geometry of the weld toe and greatly reducing the stress concentration factor at the weld toe;
· The corrosion resistance of the weld and its heat affected zone in a corrosive environment is greatly improved;
· It is used to eliminate the residual stress of welding, and can completely replace the aging method such as heat treatment and vibration aging, and the treatment process is simple and the effect is stable and reliable. If you want to deal with where to deal with it, and can be carried out at any time and in any process; therefore, it is especially suitable for the treatment of the local welding repair parts of mechanical parts to eliminate the welding stress;
· Eliminate micro-cracks and slag defects in the surface of the weld toe, and inhibit the early initiation of cracks;
· Local strengthening treatment, which produces a certain compressive stress on the surface of the part (and the preset compressive stress value is controllable), thereby improving the surface quality and fatigue life of the part;
· Because Hawker can eliminate the welding stress treatment and simultaneously improve the factors affecting the weld fatigue performance: weld toe geometry, residual stress, micro crack and slag defect, surface strengthening, etc., thus greatly improving the welded joint Fatigue strength and fatigue life.
It is precisely because of the above-mentioned special technical advantages that Hawker's elimination of welding stress equipment is more and more widely used in the production of military welded structural parts and the repair of products.
1. Application on aero engines
The residual stress control of the welded components on the aeroengine is very strict. In the industry, there is no way to let the aircraft carry the stress. The performance test of the 410 factory after ten months proves that the Hawker can completely eliminate the welding stress equipment. The requirement for aero-engine welding components to eliminate residual stresses can be applied to the production and maintenance of engines. However, due to the narrow space of the aero-engine structure and the high-strength sheet of the base metal, it is not allowed to produce traces on the surface of the parts. Therefore, according to the requirements of the 410 factory, a dedicated Hawker can eliminate the welding stress equipment for the aeroengine, and Other aero engine repair shops have been well applied.
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