Automatic welding technology for butt joint of low alloy steel and nickel base alloy dissimilar steel heat-exchange tubes

Abstract

The invention discloses an automatic welding technology for butt joint of low alloy steel and nickel base alloy dissimilar steel heat-exchange tubes. The automatic welding technology comprises the following steps that a heat-exchange tube I (1), a heat-exchange tube II (3), and a melting ring (2) are cleaned; the heat-exchange tube I (1), the heat-exchange tube II (3), and the melting ring (2) are assembled; welding equipment is installed and debugged; and parameters of the welding technology are set, and welding treatment is started. The automatic welding technology for butting joint of low alloy steel and nickel base alloy dissimilar steel heat-exchange tubes combines special heat-exchange tube specifications and special welding technology parameters and choose of tungsten electrode, and is applied to butt welding between heat-exchange tubes of small diameters and big thick walls, the welding process is stable and reliable, formation of a welding joint is even and artistic, the welding joint is well fused, the welding efficiency is high, all destructive tests and physical and chemical performance tests are conducted, and the result meets the requirement for welding quality of the dissimilar steel heat-exchange tubes in a high temperature gas cooled reactor steam generator.

Description

technical field [0001] The invention relates to an automatic butt joint welding process of dissimilar steel heat exchange tubes for heat exchanger pressure vessel equipment, in particular to a nuclear power heat exchange main equipment, especially the first high temperature gas-cooled reactor, fast neutron reactor, etc. Automatic butt welding process of low-alloy steel and nickel-based alloy dissimilar steel heat exchange tubes for steam generators of fourth-generation nuclear power technology. Background technique [0002] The high temperature gas-cooled reactor steam generator independently designed by my country has a different structure of heat exchange tubes from the previous pressurized water reactor and boiling water reactor. The main heat exchange tube of the high temperature gas-cooled reactor steam generator is in the form of a spiral coil, which is divided into low-alloy steel heat exchange tubes in the low-temperature section of the spiral coil tube and nickel-ba...

AI Technical Summary

Problems solved by technology

The welding process not only needs to ensure that the butt welds of the heat exchange tubes are well fused, but also control the two sides of the welds not to be sunken, and at the same time not exceed the surface of the heat exchange tubes by 0.45mm, and ensure that the φ of the ball is not less than 12.1mm. Tubes are extremely difficult to weld

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