Moderate and high strength large-thickness component electromagnetic controlling narrow gap or ultra-narrow gap pulse efflux molten electrode gas-shield welding method and equipment

A melting electrode gas, electromagnetic control technology, used in welding equipment, welding equipment, arc welding equipment and other directions, can solve the problem of inability to solve the continuous high current range droplet transition stability, the external box-shaped nozzle is complex in shape and structure, and high in height. The problem of low adjustment accuracy of the adjustment device, to achieve the effect of reducing chemical inhomogeneity, reducing welding defects, and reducing sensitivity

Inactive Publication Date: 2008-03-19
CHONGQING UNIV
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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 coolin

Method used

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  • Moderate and high strength large-thickness component electromagnetic controlling narrow gap or ultra-narrow gap pulse efflux molten electrode gas-shield welding method and equipment
  • Moderate and high strength large-thickness component electromagnetic controlling narrow gap or ultra-narrow gap pulse efflux molten electrode gas-shield welding method and equipment
  • Moderate and high strength large-thickness component electromagnetic controlling narrow gap or ultra-narrow gap pulse efflux molten electrode gas-shield welding method and equipment

Examples

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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 fixed on 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 an electromagnetically controlled narrow-gap or ultra-narrow-gap pulse jet melting electrode gas-shielded welding method and equipment for medium-high-strength and large-thickness components. 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...

Claims

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Application Information

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IPC IPC(8): B23K9/173B23K9/08B23K9/095B23K35/38B23K9/32H01F27/16
Inventor 罗键王颖
Owner CHONGQING UNIV
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