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Method for induction heating fusion-cast welding of copper-tungsten mold

A technology of induction heating and induction coil, which is applied in the field of induction heating melting and casting welding in copper-tungsten molds, can solve the problems of slag inclusion at the bonding interface, unstable bonding strength and performance, and can not guarantee the welding rate, etc., and achieve stable bonding performance , Reduce interfacial stress, excellent quality effect

Active Publication Date: 2011-07-06
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of friction welding is that tungsten and copper have a certain welding area, but the welding rate cannot be guaranteed to reach 100%, the joint interface has defects such as slag inclusion, and the joint strength and performance are unstable
[0004]Compared with the traditional process, the process of depositing copper alloy on the tungsten substrate can realize the metallurgical combination of tungsten and copper, meet the strength requirements, the joint interface structure is uniform, and the welding rate It reaches 100%. The current literature shows that there is no research report on this process.

Method used

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  • Method for induction heating fusion-cast welding of copper-tungsten mold
  • Method for induction heating fusion-cast welding of copper-tungsten mold
  • Method for induction heating fusion-cast welding of copper-tungsten mold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] exist Deposit welding pure copper layer on the surface of powder metallurgy tungsten rod cylinder with diameter:

[0031] Process the graphite mould, the size of the molding die is: outer diameter 25mm, inner diameter 19mm, height 25mm, bottom thickness 6mm. Turn the external thread on the bottom of the tungsten rod, the specification is Same as at the bottom of the graphite forming die internal thread. Tungsten rods, copper rings and molds are cleaned before welding, firstly acetone cleaning to remove oil stains, followed by concentrated sulfuric acid (95%-97%): concentrated hydrochloric acid (38%): water = 15: 15: 70 (volume ratio ) ratio to prepare a cleaning solution for cleaning, and after cleaning, the fast connection between the tungsten rod and the molding die is realized through threads. Process the copper rod with an outer diameter of 18mm, an inner diameter of 6mm, and a height of 15mm, place it in the forming mold, and cover it outside the tungsten ro...

Embodiment 2

[0033] exist Deposit welding pure copper layer on the surface of powder metallurgy tungsten rod cylinder with diameter:

[0034] Process the graphite mould, the size of the molding die is: outer diameter 25mm, inner diameter 19mm, height 25mm, bottom thickness 6mm. Turn the external thread on the bottom of the tungsten rod, the specification is Same as at the bottom of the graphite forming die internal thread. Tungsten rods, copper rings and molds are cleaned before welding, firstly acetone cleaning to remove oil stains, followed by concentrated sulfuric acid (95%-97%): concentrated hydrochloric acid (38%): water = 15: 15: 70 (volume ratio ) ratio to prepare a cleaning solution for cleaning, and after cleaning, the fast connection between the tungsten rod and the molding die is realized through threads. Process the copper rod, the size is 18mm in outer diameter, 8mm in inner diameter, and 15mm in height, place it in the forming mold, and cover it outside the tungsten rod...

Embodiment 3

[0036] exist Deposit welding pure copper layer on the surface of powder metallurgy tungsten rod cylinder with diameter:

[0037] Process the graphite mould, the size of the molding die is: outer diameter 25mm, inner diameter 19mm, height 25mm, bottom thickness 6mm. Turn the external thread on the bottom of the tungsten rod, the specification is Same as at the bottom of the graphite forming die internal thread. Tungsten rods, copper rings and molds are cleaned before welding, firstly acetone cleaning to remove oil stains, followed by concentrated sulfuric acid (95%-97%): concentrated hydrochloric acid (38%): water = 15: 15: 70 (volume ratio ) ratio to prepare a cleaning solution for cleaning, and after cleaning, the fast connection between the tungsten rod and the molding die is realized through threads. Process the copper rod, the size is 18mm in outer diameter, 11mm in inner diameter, and 15mm in height, place it in the forming mold, and cover it outside the tungsten r...

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Abstract

The invention discloses a method for induction heating fusion-cast welding of a copper-tungsten mold, which comprises the following steps: cleaning and assembling a tungsten rod, a copper ring and a graphite mold, wherein the tungsten rod is fixed on the graphite mold, and the copper ring is sheathed between the tungsten rod and the graphite mold; filling protective agents in gaps and tops of the copper ring, the tungsten rod and the formed graphite mold; sheathing a cylindrical substrate induction ring outside the graphite mold to lead the height of the position to be the same as that of copper materials, then conducting graded heating to the graphite mold by utilizing the induction ring, stopping heating after the copper ring is molten, and leading the copper and the tungsten rod to generate alloy combination to complete fusion-cast welding through directional solidification. The method is simple in process, has 100 percent of welding rate, has no defects of slag inclusion, non-welding and the like on the surfaces, is zero in fusion depth, and has no dilution rate problem, and the compositions and performances of the fusion-cast layer are not influenced by substrate metal, the bonding performance is stable and the quality is excellent.

Description

technical field [0001] The invention relates to a special welding technology, in particular to an induction heating fusion casting welding method in a copper-tungsten mold. Background technique [0002] In the welding of metal surfaces such as container corrosion resistance layer and elastic belt, wire feed welding, laser cladding, strip welding, in-mould casting welding (MSW), friction welding and other technologies are usually used. Overlay welding technology such as melting electrode gas shielded overlay welding, submerged arc strip electrode overlay welding, TIG overlay welding, etc., the melting electrode (welding wire) itself is the deposited metal, and an arc is generated between the melting electrode and the base metal, and the base metal is used as the cathode or anode Melted by the heat of the arc, the deposited metal mixes with the molten base metal to form a metallurgical bond. The base metal in the surfacing process has a large penetration depth, and the deposi...

Claims

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Application Information

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IPC IPC(8): B22D19/16
Inventor 王克鸿张德库陈杰
Owner NANJING UNIV OF SCI & TECH
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