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Automatic five-wire submerged arc welding method for thick-wall welded pipes

A technology of automatic submerged arc welding and welding method, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of poor welding joint stability, large heat input, etc., to achieve high productivity, small heat affected zone, welding seam The effect of uniform metal structure

Inactive Publication Date: 2012-10-24
上海中油天宝巴圣钢管有限公司
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, the existing five-wire submerged arc welding process has the problem of large heat input when welding thick-walled pipes, and the stability of the welded joint is poor.

Method used

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  • Automatic five-wire submerged arc welding method for thick-wall welded pipes
  • Automatic five-wire submerged arc welding method for thick-wall welded pipes
  • Automatic five-wire submerged arc welding method for thick-wall welded pipes

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Embodiment Construction

[0019] Below in conjunction with accompanying drawing and specific embodiment the present invention will be described in further detail:

[0020] like figure 1 As shown, a five-wire automatic submerged arc welding method for thick-walled welded pipes according to the present invention includes five welding wires 1, which obtain stable weld joint performance, and the specific implementation methods are:

[0021] 1. Power configuration and connection method:

[0022] The internal and external five-wire welding adopts the tandem five-wire four-power welding technology. The power supply uses Lincoln's DC and AC power supplies, and adopts a DC-AC hybrid power supply configuration: DC-AC-AC-AC-AC. When the AC power supply is connected, the phase difference of the current is 120o, which can effectively avoid the electromagnetic interference generated between the AC arcs and ensure the stable combustion of the arc during welding.

[0023] 2. Spatial position of welding wire 1:

[...

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Abstract

The invention discloses an automatic five-wire submerged arc welding method for thick-wall welded pipes. The automatic five-wire submerged arc welding method uses five welding wires. The welding inclination angles of the five welding wires along the travelling directions of the welded pipes are arranged from forward inclination to backward inclination sequentially. Therefore, the root of a welding pass of a weldment can be welded thoroughly, welding forming is achieved at one time, excess welding defects can be avoided, productivity is high, heat affected zone is small, and welding metal structure is uniform. The automatic five-wire submerged arc welding method for the thick-wall welded pipes can be widely applied to mass longitudinally submerged arc welding of steel pipes.

Description

technical field [0001] The invention relates to a welding method, in particular to a five-wire automatic submerged arc welding method for thick-walled welded pipes. Background technique [0002] At present, the commonly used methods of metal welding mainly include fusion welding, pressure welding, brazing, etc. Among them, the most widely used welding methods in manufacturing industries such as structural parts are electrode consumption type and electrode consumption type. The electrode consumption welding method is divided into gas shielded welding, gas welding, submerged arc welding, etc. The existing submerged arc welding is to pile up the flux on the weldment first, then bury the continuously supplied welding wire, weld after the arc is struck, and Welding slag is continuously produced. At this time, the arc is buried by the flux and cannot be seen from the outside. The flux plays a protective role. It is a method in which the arc burns under the flux layer for welding....

Claims

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Application Information

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IPC IPC(8): B23K9/18
Inventor 不公告发明人
Owner 上海中油天宝巴圣钢管有限公司
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