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Vacuum brazing method of plasma cutting electrode

A cutting electrode and brazing method technology, applied in the field of material welding, can solve the problems of complicated operation, high price of pure silver cooling jacket, complex structure of plasma cutting electrode assembly, etc., achieves good surface quality, simplifies vacuum brazing process, simple structure

Inactive Publication Date: 2013-08-07
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this technology not only has the problem that the pure silver cooling jacket used is expensive, but also needs to be connected with the copper sleeve and the hafnium wire respectively during welding, and foil-shaped and wire-shaped solders are also required for the connection. In addition, It is also necessary to formulate a special positioning fixture to position the brazing gap, which has the disadvantages of cumbersome operation and complex structure of plasma cutting electrode assembly

Method used

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  • Vacuum brazing method of plasma cutting electrode
  • Vacuum brazing method of plasma cutting electrode
  • Vacuum brazing method of plasma cutting electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] according to figure 1 , first assemble the oxygen-free copper sleeve 1, silver-copper eutectic solder wire 2 (diameter 2.5mm, height 1.6mm), hafnium wire 3 according to the assembly gap of 0.03mm, and then put the oxygen-free copper sleeve upright , placed in the fixture 4 whose bottom is horizontal.

[0032] Place the assembly in a vacuum furnace and evacuate to 8×10 -3 Pa.

[0033] First heat at 20°C / min to 400°C and hold for 20 minutes; then heat at 10°C / min to 750°C and hold for 60 minutes; then heat at 20°C / min to 840°C and hold for 20 minutes.

[0034] After cooling out of the furnace, a plasma cutting electrode with full joint filling, no solder flow phenomenon, no cracks in the joint, and a moderate thickness of the compound layer is obtained. The plasma cutting electrode is only composed of a copper sleeve and a hafnium wire.

[0035] The resistivity of the obtained electrode measured by the resistance method is 0.04×10 -6 Ω·m.

Embodiment 2

[0037] according to figure 1 , first assemble the oxygen-free copper sleeve 1, silver-copper eutectic solder wire 2 (diameter 2.5mm, height 1.8mm), hafnium wire 3 according to the assembly gap of 0.05mm, and then put the oxygen-free copper sleeve upright , placed in the fixture 4 whose bottom is horizontal.

[0038] Put the assembly into a vacuum furnace and evacuate to 1×10 -2 Pa.

[0039] First heat at 20°C / min to 400°C and hold for 20 minutes; then heat at 10°C / min to 750°C and hold for 60 minutes; then heat at 20°C / min to 820°C and hold for 40 minutes.

[0040] After cooling out of the furnace, a plasma cutting electrode with full joint filling, no solder flow phenomenon, no cracks in the joint, and a moderate thickness of the compound layer is obtained. The plasma cutting electrode is only composed of a copper sleeve and a hafnium wire.

[0041] The resistivity of the obtained electrode measured by the resistance method is 0.03×10 -6 Ω·m.

[0042] In summary, the vac...

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Abstract

The invention discloses a vacuum brazing method of a plasma cutting electrode. The method comprises the following steps of: assembling a plasma cutting electrode composite member; putting the assembled member into a vacuum furnace; vacuumizing; heating to the brazing temperature step by step; and brazing, cooling and discharging. The method is characterized in that the step of assembling the plasma cutting electrode composite member comprises the following sub-steps of: putting a brazing filler metal wire and a hafnium wire into a copper sleeve seat sequentially from bottom to top, then erecting the copper sleeve seat, and putting the copper sleeve seat into a fixture with a horizontal bottom. Compared with the prior art, the vacuum brazing method disclosed by the invention has the beneficial effects that the vacuum brazing technology of the plasma cutting electrode is simplified; the copper sleeve seat and the hafnium wire are directly brazed by a vacuum brazing method, and the obtained electrode is simple in structure, low in cost, good in surface quality and uniform and dense in weld joint; and moreover, the resistivity of the electrode measured by a resistance method is only (0.03-0.04)*10<-6>ohmm.

Description

technical field [0001] The invention relates to a vacuum brazing method, in particular to a vacuum brazing method for plasma cutting electrodes, and belongs to the technical field of material welding. Background technique [0002] In industrial production, fine plasma cutting technology is close to the quality of laser cutting in terms of material cutting surface quality, but the cost is much lower than laser cutting. Therefore, in recent years, the number of CNC plasma cutting equipment in various enterprises has increased very rapidly. However, high-efficiency CNC plasma cutting equipment currently mainly relies on imports, and the electrode, which is a key wearing part of the equipment, must be purchased as an accessory at the same time, which is expensive. As the main consumables in plasma cutting operations, the electrode has a direct impact on the processing cost and production efficiency of plasma cutting. The more frequently the electrode is replaced, the higher the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/008
Inventor 秦优琼于治水
Owner SHANGHAI UNIV OF ENG SCI