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Flux-cored arc welding method for K-shaped groove of 80-mm super-thick steel plate

A technology of gas-shielded welding and gas-shielded welding wire, which is applied to welding equipment, arc welding equipment, and the edge of workpieces, etc. It can solve the problems of large residual stress in the weld seam, high rigidity of the extra-thick steel plate structure, and fast cooling speed. The effect of performance satisfaction

Inactive Publication Date: 2013-03-13
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the high rigidity of the extra-thick steel plate structure, the cooling speed after welding is fast, and the weld seam is subject to greater restraint, so the residual stress on the weld seam is also large, which is prone to large deformation, resulting in poor plate shape after welding

Method used

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  • Flux-cored arc welding method for K-shaped groove of 80-mm super-thick steel plate
  • Flux-cored arc welding method for K-shaped groove of 80-mm super-thick steel plate
  • Flux-cored arc welding method for K-shaped groove of 80-mm super-thick steel plate

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Embodiment 1

[0020] This embodiment is a gas-shielded welding method for 80mm extra-thick steel plate K-groove flux-cored wire. Two pieces of E36N-Z35 marine engineering with a size of 800mm (steel plate longitudinal)×200mm (steel transverse direction)×80mm (thickness) are selected. The steel plates are spliced ​​with flux-cored wire gas shielded welding, the shielding gas is 100% carbon dioxide gas, and the two steel plates are spliced ​​and welded with a line energy of 6kJ / cm. Before welding, the test plate is machined with a symmetrical K-shaped groove, and then press figure 1 Assembled by the method in the above, the base welding is performed first. Then perform gas shielded welding with flux-cored wire on the front side, weld to 2 / 3 of the depth of the groove, and then clean the root with carbon arc gouging or a grinder machine. After polishing, perform gas shielded welding with flux-cored wire on the back side. Solder the rest of the front side after the soldering is complete. The ...

Embodiment 2

[0025] This embodiment is a gas-shielded welding method for 80mm extra-thick steel plate K-groove flux-cored wire. Two pieces of E36N-Z35 marine engineering with a size of 800mm (steel plate longitudinal)×200mm (steel transverse direction)×80mm (thickness) are selected. The steel plates are spliced ​​by flux-cored wire gas shielded welding, and the steel plates are spliced ​​and welded with a line energy of 20kJ / cm. Before welding, the test plate is machined with a symmetrical K-shaped groove, and then press figure 1 Assembled by the method in the above, the base welding is performed first. Then carry out gas-shielded welding with flux-cored wire on the front side groove. The shielding gas is 100% carbon dioxide gas. After welding to 2 / 3 of the groove depth, carbon arc gouging or root cleaning with a grinder is performed, and then the reverse side groove core is performed after polishing. Welding with wire gas shielded welding, after all the reverse side is welded, weld the r...

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Abstract

The invention relates to a flux-cored arc welding method for a K-shaped groove of an 80-mm super-thick steel plate. The groove takes a symmetric K-shaped groove; the upper opening angle and the lower opening angle of the groove are both 45-50 degrees; the root truncated edge of the groove is 0-1 mm; and the assembly interval of the groove is 0-3 mm. A solid gas protection welding wire under pulse current is adopted to implement the backing welding for a root run on the front surface of a test board of the K-shaped groove when welding, so that part of weld metal penetrates through the reverse side of the groove to finish the backing welding after the root run is molten thoroughly; and then the front surface flux-cored arc welding is carried out, and the reverse side back chipping is implemented when the groove is welded at the 2 / 3 depth; after that, the reverse side submerged-arc welding is carried out until the groove is fully filled; and finally, the front surface of the groove is welded for the left 1 / 3 depth after the reverse side is welded totally. The flux-cored arc welding method for the K-shaped groove of the 80-mm super-thick steel plate disclosed by the invention simplifies the welding operation, decreases the turning-over times, reduces the labor intensity, and improves the working efficiency; obtained soldering blocks have small residual deformation and high welding quality; and the welding method is suitable for the welding in the fields, such as ocean engineering and the like.

Description

technical field [0001] The invention relates to a gas-shielded welding method, in particular to a gas-shielded welding method for an 80mm extra-thick steel plate with a K-groove flux-cored wire. Background technique [0002] Flux cored wire gas shielded welding is an important welding method, but for extra thick plates, flux cored wire gas shielded welding is also prone to defects such as pores, cracks, slag inclusions, incomplete fusion, and incomplete penetration. The important welding difficulty of flux-cored wire gas shielded welding of extra-thick plate is that the welding deformation is not easy to control, and the main cause of welding deformation is the welding residual stress caused by the uneven temperature field generated by welding. There are two main factors affecting welding stress and deformation, one is the range and degree of uneven heating in and around the weld, that is, the range and degree of thermal deformation; the other is the stiffness of the weldmen...

Claims

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Application Information

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IPC IPC(8): B23K9/16B23K33/00
Inventor 车马俊崔强邓伟李丽吴年春尹雨群汪晶洁刘朝霞李恒坤
Owner NANJING IRON & STEEL CO LTD
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