Experimental Research on Pre-heating Multi-wire SAW Process for X60 Ф559mm×32mm LSAW Pipe

In order to increase the multi-wire SAW welding speed for the LSAW pipe，the welding comparative experiment for the X60 Ф559 mm×32 mm steel pipe is conducted via the pre-heating 4-wire SAW process，and a comparison with the conventional 4-wire SAW process is made. The result shows that compared with the said conventional 4-wire SAW process，the pre-heating 4-wire SAW process brings about such advantages as the welding speed is increased by 20%，the welding wire energy consumption is reduced by 10%，and the overall mechanical performance is excellent. It is proved that under the pre-conditions that the weld quality and the mechanical properties of the pipe are guaranteed，the above mentioned pre-heating multi-wire SAW process can obviously increase the welding speed for the LSAW pipe.