Full penetration welding method for marine pipe fittings
A welding method and full penetration technology, which is applied in the field of full penetration welding of marine pipe fittings, marine pipe-pipe and pipe-elbow full penetration welding, can solve the problem of not meeting the welding requirements of laser-arc hybrid welding and difficult to guarantee processing Problems such as dimensional accuracy, alignment accuracy before welding, and poor roundness consistency have achieved the effects of good adaptability to workpiece processing and alignment accuracy, improving welding efficiency, and ensuring welding quality
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Embodiment 1
[0044] The pipe fitting 1 to be welded is a marine carbon steel pipe with a diameter of 160 mm and a wall thickness of 12 mm. The welding joint is butt joint, and the welding wire is ER50-6.
[0045] The implementation is as follows:
[0046] Step 1: Open a V-shaped groove on the pipe fitting 1 to be welded, and the groove angle is 60°; then assemble it so that the gap between the pair is 0, and the misalignment amount is 0~2mm, and perform tack welding. The highest point on the surface of the tack welding spot reaches The maximum distance d of the inner wall of the pipe fitting 1 to be welded 0 2mm;
[0047] Step 2: The angle α between the GMAW welding wire-3 and the vertical direction 1 is 45°, the contact point O of GMAW welding wire-3 and pipe fitting 1 to be welded 1 The distance d to the vertical plane passing through the center O of the cross-section of the pipe fitting 1 to be welded 1 The welding current is 130A, the welding speed is 300 mm / min, and the GMAW weldi...
Embodiment 2
[0052] The pipe fitting 1 to be welded is a marine carbon steel pipe with a diameter of 160 mm and a wall thickness of 12 mm. The welding joint is butt joint, and the welding wire is ER50-6.
[0053] The implementation is as follows:
[0054] Step 1: Open a V-shaped groove on the pipe fitting 1 to be welded, with a groove angle of 60°; The maximum distance d of the inner wall of the pipe fitting 1 to be welded 0 2mm;
[0055] Step 2: The angle α between the GMAW welding wire-3 and the vertical direction 1 is 45°, the contact point O of GMAW welding wire-3 and pipe fitting 1 to be welded 1 The distance d to the vertical plane passing through the center O of the cross-section of the pipe fitting 1 to be welded 1 The welding current is 130A, the welding speed is 220 mm / min; the GMAW welding wire 13 swings, the swing frequency is 1.0Hz, and the swing range is 1.0mm; the pipe fitting 1 to be welded is rotated, and the downhill welding is adopted, and the first GMAW welding ; ...
Embodiment 3
[0060] The pipe fitting 1 to be welded is a marine carbon steel pipe with a diameter of 160 mm and a wall thickness of 12 mm. The welding joint is butt joint, and the welding wire is ER50-6.
[0061] The implementation is as follows:
[0062] Step 1: Open the V-shaped groove of the pipe fitting 1 to be welded, and the groove angle is 60°; then assemble it so that the gap between the pair is 3mm, and the amount of misalignment is 0~2mm, and perform tack welding. The maximum distance d of the inner wall of the pipe fitting to be welded 0 2mm;
[0063] Step 2: The angle α between the GMAW welding wire-3 and the vertical direction 1 is 50°, the contact point O of GMAW welding wire-3 and pipe fitting 1 to be welded 1 The distance d to the vertical plane passing through the center O of the cross-section of the pipe fitting 1 to be welded 1 The welding current is 130A, the welding speed is 160 mm / min; the GMAW welding wire 13 swings, the swing frequency is 1.0Hz, and the swing ra...
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