Large depth-of-fusion and large depth-to-width ratio perforated plasma arc welding device and welding method

A welding device and plasma arc technology, applied in the field of plasma welding, can solve problems such as molten pool collapse, small depth and width, and limited workpiece thickness, and achieve the effects of good stiffness, strong compression, and strong restraint of eddy currents

Active Publication Date: 2019-03-19
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing perforated plasma arc welding technology can only penetrate the thickness of the workpiece in a single pass (generally less than 12mm), and the depth-to-width ratio is small (that is, the weld seam width is large, and the molten pool on the back is prone to collapse), which limits The industrial application of this advanced technology in the welding of large thickness workpieces

Method used

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  • Large depth-of-fusion and large depth-to-width ratio perforated plasma arc welding device and welding method
  • Large depth-of-fusion and large depth-to-width ratio perforated plasma arc welding device and welding method
  • Large depth-of-fusion and large depth-to-width ratio perforated plasma arc welding device and welding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A perforated plasma arc welding device with large penetration depth and large depth-to-width ratio, including a welding torch. There is a gas hood, and the protective gas is passed between the water-cooled copper nozzle and the gas hood.

[0038] The outer surface of the porcelain sleeve is provided with a spiral guide groove, such as image 3 As shown, the ionized gas is passed between the porcelain sleeve and the water-cooled copper nozzle, and the arc is ejected from the end of the water-cooled copper nozzle after ionization. The ionized gas passes between the inner wall of the water-cooled copper nozzle and the diversion groove, and the ionized gas flows out from the outlet of the water-cooled copper nozzle. , the ion gas forms a vortex in the lower cavity of the water-cooled copper nozzle; the volume of the lower cavity of the water-cooled copper nozzle is smaller than that of the upper cavity, and the inner wall of the lower cavity is a streamlined inner wall.

...

Embodiment 2

[0041] A perforated plasma arc welding device with large penetration depth and large aspect ratio, its structure is as described in Example 1, the difference is that the diversion groove on the outer surface of the porcelain sleeve is an arc-shaped groove, and the arc size of the diversion groove is R1.4, the unit is mm, the number of diversion grooves is 4, and the number of turns of diversion grooves is 3 turns.

[0042] The ion gas is restricted by the diversion groove and the inner wall of the nozzle, and the restriction of the ceramic sleeve is not released until it is close to the tip of the tungsten electrode. The free path of the ion gas is short and its directivity is strong, which is beneficial to the increase of arc stiffness. Compared with the direct blowing air flow, the gas in the vortex converges spirally towards the center, and its center is a low-pressure area, which is conducive to the stability of the arc column at the center of the nozzle hole, which not onl...

Embodiment 3

[0044] A perforated plasma arc welding device with large penetration depth and large aspect ratio, its structure is as described in Embodiment 2, the difference is that the arc size of the diversion groove is R0.5, the unit is mm, and the number of diversion grooves 3, and the number of turns of the diversion groove is 1 turn.

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Abstract

The invention relates to a large depth-of-fusion and large depth-to-width ratio perforated plasma arc welding device and a welding method, and belongs to the technical field of plasma welding. The welding device comprises a welding gun, the end part of the welding gun comprises a tungsten electrode, a porcelain sleeve is arranged on the outer side of the tungsten electrode in a sleeved mode, a water-cooled copper nozzle is arranged on the outer side of the porcelain sleeve in a sleeved mode, a gas cover is arranged on the outer side of the water-cooled copper nozzle in a sleeved mode, and protective gas is introduced between the water-cooled copper nozzle and the gas cover; a spiral flow guide groove is formed in the outer surface of the porcelain sleeve, ionized gas is introduced betweenthe porcelain sleeve and the water-cooled copper nozzle, the ionized gas flows between the inner wall of the water-cooled copper nozzle and the flow guide groove, the ionized gas flows out of the outlet of the water-cooled copper nozzle, and the ionized gas forms a vortex at the lower cavity of the water-cooled copper nozzle; the volume of the lower cavity of the water-cooled copper nozzle is smaller than the volume of the upper cavity, and the inner wall of the lower cavity is a streamline inner wall. The free stroke of the ionized gas is short, the directivity of the airflow is strong, so that it is beneficial to increase of the arc stiffness. Compared with an eddy current forming condition in an existing structure, the welding device has method has the advantages that the restrain of the eddy current is strong, the controllability good and the eddy current effect is obvious.

Description

technical field [0001] The invention relates to a perforation plasma arc welding device and welding method with large penetration depth and large aspect ratio, belonging to the technical field of plasma welding. Background technique [0002] At present, the welding of large-thickness workpieces common in industry is mainly through processing the groove (V-shaped, Y-shaped, etc.), and then filling the groove with multi-layer single-pass or multi-layer multi-pass welding methods, so as to realize welding . However, this method requires pre-grooving, which not only causes waste of materials, but also takes a lot of time and labor, consumes a lot of manpower and material resources, and reduces production efficiency. In addition, the multi-layer welding welding process is complicated, which is easy to cause welding defects. [0003] In the perforation plasma arc welding process, after the arc undergoes three compression methods: mechanical compression, thermal compression and e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K10/02
CPCB23K10/02
Inventor 贾传宝于长海张金衡李云武传松
Owner SHANDONG UNIV
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