Automatic tungsten argon arc welding method for completely penetrated fillet weld of nuclear power main pipeline and branch pipe

Abstract

The invention provides an automatic tungsten argon arc welding method for a completely penetrated fillet weld of a nuclear power main pipeline and a branch pipe. In the invention, automatic pipeline welding equipment provided with an AVC (Arc Voltage Control) function, a freedom welding function and an offline programming function is matched with reasonable welding norms, trajectories and sequences as well as forms of a bevel and dimension of a connector to realize the automatic tungsten argon arc welding for a saddle weld of a completely penetrated connector of the nuclear power main pipeline and the branch pipe, so that the shortcomings of high welding deformation, high consumption of welding materials, complex intermediate processes, severe working environment for labors and the like of the conventional welding process (manual TIG (Tungsten Inert Gas) or manual TIG + SMAW (Shielded Metal Arc Welding)) for the completely penetrated fillet weld of the nuclear power main pipeline and the branch pipe are overcome; and product quality is further stabilized.

Description

technical field [0001] The invention relates to a welding process method, in particular to an automatic tungsten argon arc welding process technology for a saddle weld seam of a nuclear power main pipeline and a branch pipe full-penetration joint. Background technique [0002] In order to observe the temperature and flow velocity of the high-temperature and high-pressure water inside the reactor, a large number of thermowell sockets, flow meter joints and surge line joints are distributed on the main pipeline of nuclear power plants. According to the specifications, the joints should be full penetration joints. From what is known so far, most of the welding processes for this kind of joints at home and abroad are traditional manual argon tungsten arc welding and electrode arc welding. Due to the limitations of the two processes, the joints have the following Disadvantages: ① It is difficult to control the internal quality, welding stress and welding deformation: ② Since this...

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Problems solved by technology

From what is known so far, most of the welding processes for this kind of joints at home and abroad are traditional manual argon tungsten arc welding and electrode arc welding. Due to the limitations of the two processes, the joints have the following Disadvantages: ① It is difficult to control the internal quality, welding stress and welding deformation: ② Since this kind of joint is saddle-shaped, the shape of the joint is a space curve, which requires high operational skills of the welder, and the quality and size of the weld surface are often difficult to meet the technical requirements. requirements, so the workload of grinding after welding is relatively large

③This kind of joint usually adopts the method of reaming and cleaning the root after welding, and because the ratio of the outer diameter of the branch pipe to the hole diameter is large, the workload of filling welding is relatively large, and there are many space positions for the joint, resulting in high labor intensity and poor working conditions for workers

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