Method for controlling quality of linerless single-sided welding double-sided molding backing weld seam
A quality control method, single-sided welding and double-sided technology, applied in manufacturing tools, welding equipment, arc welding equipment, etc., can solve the problems of increasing welding costs, complicating welding operations, and high requirements for the configuration of welding public and auxiliary facilities.
Inactive Publication Date: 2010-06-09
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology
In order to ensure the accuracy of the groove size and the assembly gap, the construction site needs to be equipped with a special groove processing machine and a pipe counterpart. The requirements for the configuration of welding public and auxiliary facilities are very high, which virtually increases the welding cost and complicates the welding operation.
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[0020] Three different types of common low-alloy steels were selected, according to figure 1 The groove shown, the blunt edge dimension R of the welding groove is processed to 1.6mm, the assembly gap G is 2.4mm, and the corresponding welding process specification in Table 1 is adopted, and the welding shielding gas is pure CO 2 , the flow rate is 15-20L / min. The dry elongation of the welding wire is about 20mm. pass figure 2 The ideal welding process specification can be conveniently selected according to the blunt edge size of the welding groove and the assembly situation to ensure the back forming quality of the single-sided welding and double-sided forming bottoming weld.
[0021] Table 1 shows some optimized combinations of groove blunt edge size, assembly clearance and welding process specifications that can guarantee the best back weld forming quality. When the welding voltage, welding speed and welding groove angle are fixed within a certain range, the adjustment of...
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The invention discloses a method for controlling quality of a linerless single-sided welding double-sided molding backing weld seam. The method comprises the steps that: a welding groove design adopts a compound V-shaped groove, namely a lower V-shaped groove is formed by deviating the groove root face outwards from the groove root face, and an upper V-shaped groove is formed by deviating the groove root face outsides from the lower V-shaped groove; one side of the lower V-shaped groove forms an angle beta of between 30 and 40 DEG with the axis of the groove; one side of the upper V-shaped groove forms the angle alpha of between 13 and 15 DEG with the axis of the groove; the height (m) of the lower V-shaped groove is determined according to the thickness of a plate; a welding voltage is between 20 and 24 V; a welding speed is between 0.2 and 0.3 m / min; and a welding current is between 115 and 165 A. The method not only reduces cost addition caused by the addition of a molding liner, but also reduces the requirement of welding on a groove size and an assembly clearance, thereby solving the problem of single-sided welding double-sided molding backing weld under conditions of different groove sizes and assembly clearances.
Description
technical field [0001] The invention relates to welding technology, in particular to a method for quality control of liner-free single-side welding and double-side forming bottoming welds. The welding process technology of single-sided welding and double-sided forming gas shielded gas shielded bottom welding can be widely used in gas shielded metal shielded bottom welding of thick steel plates or steel pipes. Background technique [0002] At present, in the welding of thick steel plates and steel pipes, the single-sided welding and double-sided forming bottoming welding process is widely used, involving boiler and pressure vessel manufacturing, pipeline installation welding, shipbuilding, machinery manufacturing, construction steel structures and other fields. Compared with double-sided welding, single-sided welding and double-sided forming back welding process eliminates the process of turning over the weldment and cleaning the welding root on the back, the labor intensity ...
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Login to View More IPC IPC(8): B23K9/173B23K9/095B23K33/00
Inventor 刘硕钱伟方
Owner BAOSHAN IRON & STEEL CO LTD