Influence of process factors of butt welding flange on weld forming
Date:
2023-03-27
When welding butt joints by arc welding, it is usually determined whether the gap is reserved, the size of the gap and the form of the groove opening according to the thickness of the welding plate. When other conditions are certain, the larger the size of groove or clearance, the smaller the residual height of the welded seam, which is equivalent to the position of the weld decreases, and the fusion ratio decreases at this time. Therefore, clearance or groove opening can be used to control the size of residual height and adjust the fusion ratio. Compared with the open groove without clearance, the heat dissipation conditions of the two are somewhat different. Generally speaking, the crystallization conditions of the open groove are more favorable.
When welding butt joints by arc welding, it is usually determined whether the gap is reserved, the size of the gap and the form of the groove opening according to the thickness of the welding plate. When other conditions are certain, the larger the size of groove or clearance, the smaller the residual height of the welded seam, which is equivalent to the position of the weld decreases, and the fusion ratio decreases at this time. Therefore, clearance or groove opening can be used to control the size of residual height and adjust the fusion ratio. Compared with the open groove without clearance, the heat dissipation conditions of the two are somewhat different. Generally speaking, the crystallization conditions of the open groove are more favorable.
When the welding wire is tilted forward, the effect of arc force on the backward discharge of molten pool metal is weakened, the liquid metal layer at the bottom of molten pool becomes thicker, the penetration depth decreases, the depth of arc diving into the butt welding flange decreases, the moving range of arc spots expands, the penetration width increases, and the residual height decreases. The smaller the α Angle of wire forward tilt is, the more obvious the effect is. When the wire is tilted back, the opposite is true. Electrode arc welding, most of the use of electric backward tilt method, Angle α between 65° ~ 80°.
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