Welding method of low alloy steel plate and ship plate
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A technology of marine steel plate and welding method, which is applied in welding equipment, welding/welding/cutting items, metal processing, etc., can solve the problems of poor overall quality of welding seam, low welding productivity, and large deformation of welding structure, and achieve overall welding quality. Guarantee, improve production efficiency, reduce the effect of welding structure deformation
Active Publication Date: 2015-05-27
中船桂江造船有限公司
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[0003] The purpose of the present invention is to provide a process for welding low-alloy steel plates and marine steel plates, which can solve the problems of low welding productivity, poor overall quality of welds, and large deformation of welded structures in shipyards. The problem
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Embodiment 1
[0027] Example 1: Flat butt welding of 903 low-alloy steel plate + CCSB marine steel plate
[0028] Horizontal position requirements: the inclination angle of the weld seam is 0°~5°, the rotation angle of the weld seam is 0°~10°,
[0029] Welding equipment: YD-350GM welding machine is equipped with YW-35KB wire feeder, air-cooled automatic welding torch,
[0030] Welding wire: Supercored71 (flux-cored welding wire produced by Hyundai, Korea) Ф1.2
[0031] Gas: 99.9% CO 2 gas.
[0032] Process parameters: Table 1
[0033]
[0034] Follow this for flat position structural welding.
Embodiment 2
[0035] Example 2: Horizontal butt welding of 903 low alloy steel plate + CCSB marine steel plate
[0036] Horizontal position requirements: weld inclination angle is 0°~5°, weld seam rotation angle is 0°~90°,
[0037] Welding equipment: YD-350GM welding machine is equipped with YW-35KB wire feeder, air-cooled automatic welding torch,
[0042] Carry out transverse position structural welding according to this.
Embodiment 3
[0043] Example 3: Butt welding of 903 low-alloy steel plate + CCSB marine steel plate
[0044] Requirements for the supine position: the inclination angle of the weld seam is 0°~15°, the rotation angle of the weld seam is 165°~180°,
[0045] Welding equipment: YD-350GM welding machine is equipped with YW-35KB wire feeder, air-cooled automatic welding torch,
[0046] Welding wire: Supercored71 (flux-cored welding wire produced by Hyundai, Korea) Ф1.2
[0047] Gas: 99.9% CO 2 gas.
[0048] Process parameters: Table 3
[0049]
[0050] Perform structural welding in supine position according to this.
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Abstract
The invention discloses a welding method of a low alloy steel plate and a ship plate and relates to the technical field of welding. According to the welding method, through analysis and experiment, stipulates that grooves and surfaces of welding materials are subjected to dust cleaning before the two dissimilar steel boards are welded, wherein a weld width between the steel boards is less than 1mm; the back face of a slab joint is subjected to positioned welding with gas shielded welding, so that the positions of striking arc are full and arc suppression positions are filled with arc craters; welding is carried out with small specifications, multi-layer and multi-pass welding can be realized, and weld joints on each face are subjected to backing welding and cosmetic welding; for the slab joint, carbon arc gouging is adopted to machine the grooves, and the angle of the grooves is 60-70 degrees; the grooves are ground; a welding part and the both sides of the welding part are baked for dehumidification through a cutting torch before welding; the temperature of a weld joint layer and the inter-pass temperature are controlled to be below 100 DEG C. With the adoption of the welding method, the problems that by the conventional welding method for low alloy steel plates and ship steel plates, the welding production rate is low, the whole weld is poor in quality, and a welding structure is large in transformation can be solved.
Description
technical field [0001] The invention relates to the field of welding technology, in particular to a process method for welding low-alloy steel plates and ship steel plates together. Background technique [0002] In shipbuilding enterprises, it is often encountered that dissimilar steels with different linear expansion coefficients are welded together, such as welding low-alloy steel plates with marine steel plates. For the welding of low-alloy steel and marine steel plates, E5015 electrodes have been used in the past. Electrode arc welding, due to the characteristics of the material itself, manual arc welding must be used during welding, the work efficiency is low, the welding operation is difficult, and the welder's labor intensity is high; because the heat input of E5015 electrode arc welding is large, and the low alloy steel plate has strength High linear expansion coefficient, so it is easy to produce welding deformation during welding, especially when welding thin plate...
Claims
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