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Butt welding method for pipe with small diameter

A welding method and technology for small-diameter pipes, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of concave roots and incomplete penetration, so as to speed up the production cycle, speed up the cycle of production circulation, reduce the Effect of auxiliary workload

Inactive Publication Date: 2006-12-27
SHANGHAI BOILER WORKS
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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.

Method used

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  • Butt welding method for pipe with small diameter

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Embodiment 1

[0028] Such as figure 1 As shown, it is a schematic diagram of the welding direction in the upright and climbing position of the barrier-free small-diameter pipe butt joint. The described small-diameter pipe welding method adopts the "all-position" welding method, and the entire welding joint 1 is regarded as a clock. It is 6 o'clock, and the left and right are 9 o'clock and 3 o'clock respectively. At this time, the arc is struck from 6 o'clock, and the arc is fired from both sides upwards to 12 o'clock.

[0029] The all-position welding method for barrier-free small-diameter pipes includes the all-position welding method for barrier-free small-diameter tubes and the welding method for barrier-free small-diameter tubes with relatively large welding gaps.

[0030] The barrier-free small-diameter pipe welding adopts the method of all-position welding, and the method is as follows:

[0031] 1. The welding method of the first half circle adopts the method of climbing welding and ...

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Abstract

The present invention relates to a small-caliber pipe butting joint welding method, comprising unobstructed small-caliber pipe all-position welding method and obstructed small-caliber welding method, characterized in the 'all-position' welding method, meaning regarding the full crater as a clock wherein the bottom is 6 o'clock and the left and right side is separately 3 o'clock and 9 o'clock, generating the arc from 6 o'clock and extending it separately from the two sides till 12 o'clock. The present invention has the virtue of 'all-position' butting joint, which greatly reduces subsidiary workload, accelerates production circulation, increases crater butting joints, effectively controls and prevents the production of inside recess and inadequate penetration flaw and increases the percent of pass of the unobstructed small-caliber pipe butting joint crater from 93% to 97-98% and of the butting joint craters between the obstructed pipe and bank of pipes and between the bank of pipes and bank of pipes from 85-90% to over 96%, which greatly accelerates the production circle.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/028B23K9/12
Inventor 许志军
Owner SHANGHAI BOILER WORKS
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