Improve the Welding Quality of LSAW Steel Pipe

(1) Select the correct welding sequence according to the different forms of port slope
Straight seam welded steel pipe in the case can be welded on both sides, most of the groove can be welded in accordance with the first weld bead board, then the transition layer welding, weld cladding final order. To slope on both sides of the mouth of the slag and undercut with a wire brush or grinder same material sheet clean. Straight seam welded steel pipe must discharge, electrodes do not swing laterally. If only one side welding, the weld cladding can only be re-welding the transition layer, the substrate's order last weld bead welding. But submerged arc welding thick-walled steel pipe before the need to take additional protective measures, such as protective gas, and so filled the inside of the weld, the other in stratified welding bead, the bead thickness must be strictly controlled, not too thick.

(2) Strict control of weld penetration
LSAW pipe penetration welding process is difficult to judge the size, operation, welders often based on the size of the current size, the bath, indirectly determine the size of penetration. Under normal circumstances, the fusion depth buffer layer and the substrate bead is between 1.5 ~ 2.5mm as well, weld cladding, the fusion depth clad weld bead and the transition between the 0.5 ~ 1.0mm room as well.

When lsaw steel pipe outside space location is large and welding and soldering point platforms is close, the general take the flux gravity feed or pressure burdening conveying.

The new flux from the flux hopper rotatably work applied to the pressure-feeding tank, pressure tank delivery pressure of air pressure supplied to the lower portion of the solder flux splitter, then reaches the middle of the transition hopper, using gravity fed to the weld zone. Flux large diameter thick-walled pipe after use by the vacuum suction generated source Back flux splitter, and then by the middle of the transition duct to reach the bucket, and then flow to the weld zone reused. This double-sided SAW pipe flux recovery conveyor way there is a variant, it is to cancel the transfer pot flux pressure, new complementary flux hopper flux splitter directly on the upper part by weight of flux flow, as has been the loss of flux supplement . Transport flux recovery it is generally fully automatic. In the high quality requirements of the recovered flux place in the flux at the outlet of the separator plus screening and magnetic separation means to the recovered flux purification treatment.