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Moderate and high strength large-thickness component narrow gap or ultra-narrow gap magnetic control jet molten welding method

A fusion welding, narrow gap technology, applied in the direction of welding equipment, welding medium, welding equipment, etc., can not solve the problem of droplet transfer stability in the continuous high current range, the shape and structure of the external box-shaped nozzle is complicated, and the height adjustment device Adjust the problems such as low precision to achieve the effect of reducing chemical inhomogeneity, reducing welding defects, and reducing sensitivity

Inactive Publication Date: 2010-10-20
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The third item is a rotating arc narrow gap welding method and device driven by a hollow shaft motor (patent number ZL200510038527.4). The generated arc is rotated and scanned to obtain uniform and stable penetration on both sides of the nozzle. However, the shape and structure of the external box-shaped nozzle are complex, the volume is large, and the arc is poorly observable. The external nozzle does not use water cooling measures. And the adjustment precision of its height adjustment device is low
Other researchers at home and abroad hope to use a single method of changing the mixed gas ratio, and hope to use a certain helium-free mixed gas to obtain a stable rotating jet transition welding. Practice has proved that this single measure cannot solve the problem of continuous high-current interval melting Stability of the droplet transition

Method used

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  • Moderate and high strength large-thickness component narrow gap or ultra-narrow gap magnetic control jet molten welding method
  • Moderate and high strength large-thickness component narrow gap or ultra-narrow gap magnetic control jet molten welding method
  • Moderate and high strength large-thickness component narrow gap or ultra-narrow gap magnetic control jet molten welding method

Examples

Experimental program
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Effect test

example 1

[0106] Example 1: Pulse jet welding of 40mm thick 20G steel with 10mm wide and narrow gaps is controlled by an external longitudinal magnetic field. The welding process parameters are as follows to obtain a good welded joint: the external magnetic field strength is 0.01-0.05T, and the magnetic field frequency is 1-5Hz (that is, the intensity of the excitation current 8~40A, excitation current frequency is 1~5Hz), magnetic field duty ratio is 20~80%, welding current is 300~600A, welding current frequency is 1~50Hz, welding current duty ratio is 30~70%, welding speed 0.4~5m / min, argon shielding gas 15L / min, wire feeding speed 1~60m / min, welding wire dry elongation 12~25mm, welding wire diameter 1.2mm, welding wire grade H08A.

example 2

[0107] Example 2: A 50mm thick A3 steel ultra-narrow gap 4.5mm wide pulse jet welding is controlled by an external longitudinal magnetic field. Current intensity is 10-50A, excitation current frequency is 1-8Hz), magnetic field duty ratio is 20-80%, welding current is 200-600A, welding current frequency is 1-20Hz, welding current duty ratio is 30-70% , welding speed 0.3 ~ 7m / min, argon shielding gas 18L / min, wire feeding speed 15 ~ 50m / min, dry elongation of welding wire 18 ~ 28mm, wire diameter 1.2mm, wire grade H08A.

[0108] It can be seen from the above examples that the reasonable matching of the electromagnetic field and welding process parameters should be considered comprehensively, such as the length of the welding wire, the composition of the shielding gas, the welding arc voltage, the strength and frequency of the electromagnetic stirring magnetic field, etc., and the main process parameters should be systematically analyzed according to the actual welding objects an...

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Abstract

The invention relates to a gas shielded welding method and device of a narrow gap or a super-narrow gap impulse jet current consumable electrode controlled by electromagnetic of the heavy section part with middle and high strength. The invention uses a magnetic coil (3) to provide excitation current processed by an excitation source, which can generate an extra magnetic field. Under the conditions of narrow gap or super-narrow gap, high feed rate, fused drop spray transfer and impulse welding current, the process of the gas shielded welding of the rotating jet current consumable electrode with high-melting frequency pulse that is controlled by the electromagnetic for the heavy section part with middle and high strength can be realized. The device of the invention comprises the excitation source, excitation equipment, auxiliary equipment and a water cooling system. The excitation equipment is the magnetic coil (3) with or without a conducting core (5). The excitation equipment is fixedon a welding burner (6), which is positioned above a work piece (9). The excitation current provided by the excitation source (10) produces stationary or time-varying electromagnetic mixing magnetic field that has the combination control over the processes of arc welding, wire burn-off, drop transfer, melting bath flow and welding line coagulation, which finally forms the welding line of good quality.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a method and equipment for magnetron jet fusion welding of medium and high-strength thick parts with narrow gaps. Background technique [0002] With the formulation and implementation of national large-scale engineering projects and key engineering construction plans, such as the Three Gorges Project, large aircraft projects, etc., more and more major equipment is manufactured and produced using medium and high-strength materials and large-thickness structures. The application of modern welding technology occupies an important position and plays a more crucial role. [0003] Due to the complex welding process of medium and high strength and large thickness components, how to prevent weld defects, improve weld metal structure and weld joint quality, and improve welding efficiency are more prominent. At present, the main welding methods that can be used for welding ultra-thick an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/32B23K9/095B23K9/08H01F27/16B23K9/173B23K35/38
Inventor 罗键王颖
Owner CHONGQING UNIV
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