Flash welding process of high-strength low-magnetic anchor chain

Abstract

The invention provides a flash welding process of a high-strength low-magnetic anchor chain. The flash welding process is characterized in that the burn-off degree reaches 7-9 mm, the upset forging length reaches 6-8 mm, the burn-off speed reaches 1.8-2.0 mm/s, the secondary no-load voltage reaches 4.7 V, and the system pressure reaches 14-16 MPa. Compared with a conventional technological process, the flash welding process has the advantages that a pre-flash process is added, so that the problems about the rapid heat dissipation of a material and the heating of welds during low-temperature welding can be solved, the heat-affected area can be effectively enlarged, the upset forging effect can be guaranteed, and the relatively consistent shapes of welding joints can be guaranteed; sufficient upset forging pressure is exerted on welding end surfaces, gaps among the joints are rapidly reduced, the lintel blasting is stopped, liquid metal and oxide inclusion on the end surfaces are extruded, and joint areas are subjected to certain plastic deformation, so that the progress of recrystallization can be promoted, common crystal grains can be formed, and firm butt joints can be acquired; and after the upset forging is finished, the pressure of electrodes and the pressure of an upset forging oil cylinder are maintained for a certain time, and then the electrodes and the upset forging oil cylinder are cooled, so that the deformation resistance of the joints can be sufficient and welding end ports can be protected against cracking caused by ring-shaped springback.

Description

technical field [0001] The invention relates to the field of anchor chains, in particular to a flash welding process for high-strength and low-magnetism anchor chains. Background technique [0002] Anchor chains are widely used in ships and marine engineering structures, and are the chain of life to ensure the safe use of floating bodies in harsh marine conditions. With the development of marine engineering to the deep sea, various facilities have higher and higher requirements for the performance of anchor chains. In addition to basic mechanical properties, there are also corresponding requirements for other physical properties. The present invention relates to a flash welding process of a high-strength low-magnetism anchor chain. [0003] The material used in traditional anchor chains is low-alloy high-strength structural steel, but to meet the requirements of low magnetic or non-magnetic, austenitic stainless steel must be used. In addition, in order to meet the strengt...

AI Technical Summary

Problems solved by technology

This has a great impact on the flash welding process of anchor chains. The welding parameters of ordinary anchor chains are no longer applicable to this product. It