High-efficiency welding method for large perforated flange and thick-wall pipe

Abstract

The invention discloses a high-efficiency welding method for a large perforated flange and a thick-wall pipe, and relates to the field of pipe fitting welding. The method comprises the steps that S1, the flange is placed on a roller tire rack; s2, the flange and the steel pipe are positioned and connected through a stacking plate; s3, arranging a flame heating disc; s4, the flame heating disc is controlled to heat the joint of the flange and the steel pipe, and heat preservation is conducted; s5, an outer ring at the joint of the flange and the steel pipe is welded during rotation; s6, removing the code plate and the back root; s7, welding the inner ring; s8, continuously raising the temperature, heating and preserving the heat; s9, heating of the flame heating disc is stopped, and the joint of the flange and the steel pipe is naturally cooled to the normal temperature; and S10, flaw detection is conducted on all welding positions. The welding process of the flange and the pipe fitting is simpler and more convenient, and the precision and the efficiency are higher.

Description

technical field [0001] The invention relates to the field of pipe fitting welding, and more specifically relates to a high-efficiency welding method for large flanges with holes and thick-walled pipes. Background technique [0002] At present, the welding of large flanges with holes and thick-walled steel pipes generally uses the construction sequence of welding steel pipes and flanges separately. When welding, place the flange flat on the horizontal tread, and perform vertical positioning welding with the thick-walled steel pipe, and rely on the code plate to control the welding deformation inside. The construction sequence is as follows: (1) First, heat the front weld bead of the flange and the pipe. After heating to the welding requirements, the weld bead can be back welded to ensure the interlayer temperature, and the weld bead is partially filled to maintain the preheating state; ⑵Clean the back of the flange and the pipe. The temperature of the weld bead has dropped a...

AI Technical Summary

Problems solved by technology

In the flaw detection process after the manual welding is completed, it will be found that the repair rate is very high, which increases the labor hours and increases the usage of welding materials, which is not conducive to cost control.

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