Small-caliber pipe butt-welding method

Abstract

The invention relates to a small-caliber pipe butt-welding method. The method comprises a barrier-free small-caliber pipe whole-position welding method and a barrier small-caliber pipe welding method. The method is characterized in that the whole-position welding ground method is adopted, an overall welded junction is adopted as the lower side of a clock, namely, 6 o'clock, the left and right sides are 3 o'clock and 9 o'clock, at the moment, arc striking is performed at the position of 6 o'clock, arc application is performed from the two directions, and welding is performed at 12 o'clock. The method has the advantages that whole-position butt-welding is performed, auxiliary workloads are greatly reduced, the production circulation period is accelerated, and the welding junction butt-welding amount is remarkably increased; inner concave and incomplete penetration defects are effectively controlled and prevented; the first-passyield of butt-welding junctions of the barrier-free small-caliber pipe is increased from 93% to 97-98%, barrier pipes and pipe bundles are in butt welding, pipe bundles are in butt joint, the pipe junction first-passyield is increased from 85-90% to 96% or more, the welding junction first-passyield is obviously increased, and the production period is greatly shortened.

Description

technical field [0001] The invention relates to a butt welding method for small-diameter pipes, which can be used for welding pipes on the heating surface of power station boilers, and belongs to the technical field of small-diameter pipe welding. Background technique [0002] In the production process of large-capacity steam boilers, pipes with a diameter of Φ22mm-72mm and a wall thickness of δ≥4mm are called small-diameter pipes. Butt welding of small-diameter pipes is an important processing method for pipes on the heating surface of boilers. The welding quality The quality of the product has a direct impact on the manufacturing cost and production schedule. The traditional welding method is to use manual argon tungsten arc welding to seal the bottom and manual arc welding to cover the surface. This welding method is most likely to produce root concave and incomplete penetration defects when the root is ground. Contents of the invention [0003] The object of the prese...

AI Technical Summary

Problems solved by technology

The traditional welding method is to use manual argon tungsten arc welding to seal the bottom and manual arc welding to cover the surface. This welding method is most likely to produce root concave and incomplete penetration defects when rooting.

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