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Vacuum brazing process of plasma cutting electrode

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

Inactive Publication Date: 2013-04-10
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 process of plasma cutting electrode
  • Vacuum brazing process of plasma cutting electrode
  • Vacuum brazing process of plasma cutting electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] according to figure 1 First, assemble the oxygen-free copper sleeve 1, the silver-copper eutectic solder wire 2 (2.5mm in diameter, 2.0mm in height), and the hafnium wire 3 according to the assembly gap of 0.05mm, and then add Upper positioning copper ring 4, then use the lower push rod 5 located at the center of the positioning copper ring 4 to withstand the hafnium wire 3 and the upper ejector rod 6 located at the center of the axis of the copper sleeve seat 1 to press the copper sleeve seat 1, and place it at the bottom for Fixture 7 in the horizontal plane.

[0033] Place the assembly in a vacuum furnace and evacuate to 8×10 -3 Pa.

[0034] 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 30 minutes.

[0035] After cooling out of the furnace, cut off the positioning part, and obtain a plasma cutting electrode with full joint filling, no solder flow phenomen...

Embodiment 2

[0038] according to figure 1 First, assemble the oxygen-free copper sleeve 1, the silver-copper eutectic solder wire 2 (2.5mm in diameter, 1.8mm in height), and the hafnium wire 3 according to the assembly gap of 0.03mm, and then add Upper positioning copper ring 4, then use the lower ejector rod 5 located at the center of the positioning copper ring 4 to withstand the hafnium wire 3 and the upper ejector rod 6 located at the center of the axis of the copper sleeve seat 1 to press the copper sleeve seat 1, and place it at the bottom for Fixture 7 in the horizontal plane.

[0039] Put the assembly into a vacuum furnace and evacuate to 1×10 -2 Pa.

[0040] 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 830°C and hold for 40 minutes.

[0041] After cooling out of the furnace, cut off the positioning part, and obtain a plasma cutting electrode with full joint filling, no solder flow phenome...

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Abstract

The invention discloses a vacuum brazing process of a plasma cutting electrode. The vacuum brazing process comprises the following steps: assembling a plasma cutting electrode assembly; placing the assembly in a vacuum furnace for vacuumizing; stepwise heating to a brazing temperature; brazing; cooling; and discharging. The vacuum brazing process is characterized in that the procedure of assembling the plasma cutting electrode assembly comprises the following steps: firstly placing a solder wire and a hafnium wire in a copper bush seat sequentially from the top down; adding a locating copper ring around the protruding hafnium wire; propping up the hafnium wire by a lower post rod arranged at the center of the locating copper ring, and pressing the copper bush seat by an upper post rod arranged at the axle center of the copper bush seat; and finally placing the formed assembly in a fixture with a horizontal bottom plane. The vacuum brazing process has the following beneficial effects: the vacuum brazing process of the plasma cutting electrode is simplified, the copper bush seat and the hafnium wire are directly brazed, so the obtained electrode has the advantages of simple structure, low cost, good surface quality and uniform and compact welding seams; and in addition, the resistivity of the electrode measured by the resistance method is only (0.03-0.04)*10<-6>Omega.m.

Description

technical field [0001] The invention relates to a vacuum brazing process, in particular to a vacuum brazing process 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 t...

Claims

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Application Information

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