Submerged Arc Welding Deep And Narrow Groove Butt Welding Process

Submerged Arc Welding Deep and Narrow Groove Butt Welding Process

Submerged arc welding can penetrate steel with a thickness of less than 20mm at one time. Due to the large molten pool, in order to achieve the purpose of one-time forming, a formed liner must be used to make the molten pool cool and solidify on the liner, otherwise the workpiece will be easily burned through. The penetration depth during suspension welding should generally not exceed 2/3 of the plate thickness.

The following process methods can be used for single-sided welding and double-sided forming weld:

1) weld on the copper backing plate.

2) weld on the ceramic backing plate.

3) weld on the flux backing plate.

4) weld or lock bottom welding on permanent backing plate.

For the stress joint of butt-welded steel plates of different thicknesses, if the thickness deviation of the two plates exceeds the range specified in the standard, the groove size shall be selected according to the thickness of the thick plate, or the thick plate shall be thinned on one or both sides, and the thickness shall be the same as that of the thin plate. . This avoids stress concentrations due to sudden changes in cross-section at butt welded joints.

When welding butt joints of the same thickness, the wire should be on the centerline of the weld. If the welding wire is not centered, it may cause defects such as incomplete penetration and welding seam offset. When welding butt joints of different thicknesses, the welding wire should be biased to one side of the thick plate, the melting speed will be same as that of the thin plate, so that the welding seam can be formed reasonably. The figure below shows the offset of the butt joint wire.