1. Welding quality

Bellows, reinforcement rings wire mesh sleeves are prone to steel wire welding (overburning welded) during the welding process. When the hose is installed in the pipeline, due to the uneven force of the steel wire, under the pressure of the medium, the virtual Welding wire is pulled off, which can cause damage to the bellows outer drum.

The shortcomings of the longitudinal welding seam of the bellows in the metal hose, the existence of pores, dendrite looseness, etc., reduce the effective area of the wall thickness of the bellows, the insufficient strength causes cracking damage to the weld. The welding of carbon steel materials stainless steel parts constitutes an unfavorable environment typical small-area anode parts large-area cathodic parts are in contact, which can easily lead to rapid corrosion failure of the materials. Therefore, we should strengthen the welding process research welding material selection, strengthen welding quality inspection, in order to improve product reliability.

2. Mechanical processing

Due to the uneven force during the rolling process, the materials are prone to regular micro-cracks on the inside outside of the wave crest. During the welding forming process, the micro-cracks start to crack on the inner outer surfaces of the hose. the micro-cracks fatigued expanded during use eventually failed. The improvement of data processing technology welding technology can prevent the occurrence of micro-cracks.

3. Heat treatment

The primary function of heat treatment is to improve the cutting performance processing accuracy of metal materials; improve the fracture toughness of metal materials; reduce the cracking of metal materials. If the heat treatment is incomplete, it will affect product quality. For example, the temperature of solution heat treatment of austenitic stainless steel is about 1080 ℃. If the solution treatment is incomplete, the carbide cannot be fully dissolved the carbide itself precipitates in the data, which will reduce the corrosion resistance toughness of the data.

To reduce the shortcomings caused by heat treatment, the conditions for cracking should be eliminated, the external compressive stress should be improved, the quality of metal materials should be improved, alloy elements should be added appropriately.