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Welding technology for prolonging fatigue life of small branch pipe socket welding
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A fatigue life and welding process technology, applied in welding equipment, manufacturing tools, arc welding equipment, etc., can solve the problems of leakage of radioactive substances, jeopardizing the normal operation of nuclear power plants, and prone to cracks, etc. Easy to fatigue failure, the effect of improving fatigue performance
Inactive Publication Date: 2012-08-15
TIANJIN UNIV
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Under vibration conditions, due to the maximum stress at the welding root, cracks are prone to occur, and eventually lead to cracks, which will cause leakage of radioactive substances and endanger the normal operation of the nuclear powerplant.
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[0026] (1) Welding equipment should use inverter welding machines with good characteristics
[0027] (2) The small branch pipe is made of 304L stainless steel with a size of 19.4×4mm. The surface of the welding wire should be free of oil, dirt and other dirt before use.
[0028] 2. Preparation before welding
[0029] (1) Groove preparation
[0030] ① Groove shape and size see Figure 2-3 , where the socket welding flange has a ring V-shaped groove, the groove angle is 45°, and the groove depth is 5mm.
[0044] (1) Welding equipment should use inverter welding machines with good characteristics
[0045] (2) The small branch pipe is made of 304L stainless steel with a size of 19.4×4mm, and the main pipe is made of 304L stainless steel with a size of 40×10mm. The surface of the welding wire should be free of oil and dirt before use.
[0046] 2. Preparation before welding
[0047] (1) Groove preparation
[0048] ① Among them, the main pipe has a ring V-shaped groove, the groove angle is 45°, and the groove depth is 5mm. .
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Abstract
The invention discloses a welding technology for prolonging the fatigue life of small branchpipe socket welding. The welding technology comprises the following steps: (1) arranging an annular V-shaped groove on the upper edge of a flange or the center aperture of a main pipe; (2) placing a small branchpipe at a position which is vertical to the center aperture of the main pipe and has axial clearance of 1-2mm; and (3) adopting 5-layer welding for tungsteninertgas protection welding. Welding current of first and second layers from inside to outside is 100A higher than that of other layers, and the voltage is 12V; the interpass temperature is required to be 100-120 DEG C; and in fifth-layer welding, socket welding is longer along the length of the pipe wall. The welding technology can be used for improving the fatigue performance of a welding root so as to enable the welding root of the small branch pipe to be firmer, and prolonging the vibration fatigue life.
Description
technical field [0001] The invention relates to a welding process, in particular to a welding process for grooved socket welding of small branch pipes. Background technique [0002] There are many pipe fittings connected in nuclear power plants. When connecting the main pipe and the branch pipe and the flange and the branch pipe, due to the inconsistency of the diameter of the pipes, butt welding cannot be performed, and socket welding is required. The traditional socket welding is to weld the small branch pipe in the main pipe or the flange, and the weld seam is a fillet weld seam. Since the branch pipe, the flange and the main pipe are socket-fitted before welding, the weld root is the weak part after welding. Fatigue cracks are prone to develop at the weld root under low stress vibration conditions when using conventional socket welding processes. In the small branch pipes in actual nuclear power operation, it is also mainly the case of low stress, and the current failu...
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Application Information
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