Introduces the composition design of high-speed flux CHF105 GX for pipeline steel

welding metal alloy system analysis

highspeed welding process characteristics

etc. Through component control

alkalinity adjustment and selection of suitable welding speci-fications

and X90

X100 special supporting pipeline welding wire

the welding test of double wire and triple wire is carried out

and the process evaluation test is carried out in the corresponding steel pope factory. The results show that the welding process is good

the weld surface is smooth

and the weld has no bite edge and pressure pit under the conditions of 160 cm/min and 180 cm/min welding speed.After welding

the performance test is carried out. The mechanical properties of the weld metal are good. The impact work at-10℃ is above 100 J

and the average impact work at-20 ℃ is above 90 J. Weld quality

bending

hardness and other indicators meet the same level and API 5 L pipeline steel high strength and toughness standards.