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Welding head for high hardness spot welding machine and preparation method thereof

A spot welding machine, high hardness technology, used in welding equipment, manufacturing tools, welding media, etc., can solve the problem of difficult preparation of tungsten skeleton, difficult to achieve ideal uniform distribution of tungsten skeleton, and poor uniformity of composition and microstructure. and other problems, to achieve good acid and alkali resistance, good rust and heat resistance, and improve the effect of appearance and texture

Active Publication Date: 2020-03-31
宁国市顺鑫金属制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the difficulty in preparing the tungsten skeleton, and the distribution of voids is difficult to achieve an ideal uniform distribution state, the uniformity of its components and microstructure is not good.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A welding head for high-hardness spot welding machine, made of the following raw materials: 25 parts stearic acid, 10 parts silver powder, 15 parts copper powder, 75 parts WO 3 Powder, surface coating material is 0.4 part WO 3 , 0.3 parts NiO and 0.3 parts VO 2 powder.

[0028] a. Ball milling: After weighing the raw materials according to the ratio, the stearic acid powder and tungsten powder are put into a high-energy ball mill in turn, and high-energy ball milling is performed to obtain fine-grained powders of stearic acid and tungsten powder;

[0029] b. Drying: The fine-grained powder mixed with stearic acid and tungsten powder is dried in a vacuum drying oven;

[0030] c. Pressing: the fine-grained powder mixed with dried stearic acid and tungsten powder is placed in the welding head die, and then pressurized by a hydraulic press at 50 MPa / min to 200 MPa, and the pressure is maintained for 2 min to obtain a compact;

[0031] d. Sintering: Put the compact obtained in step c...

Embodiment 2

[0037] A welding head for high-hardness spot welding machine, made of the following raw materials: 30 parts stearic acid, 10 parts silver powder, 20 parts copper powder, 70 parts WO 3 Powder, surface coating material is 0.4 part WO 3 , 0.3 parts NiO and 0.3 parts VO 2 powder.

[0038] a. Ball milling: After weighing the raw materials according to the ratio, the stearic acid powder and tungsten powder are sequentially put into a high-energy ball mill for high-energy ball milling to obtain fine-grained powders of stearic acid and tungsten powder;

[0039] b. Drying: the fine-grained powder mixed with stearic acid and tungsten powder is dried in a vacuum drying oven;

[0040] c. Pressing: the fine-grained powder mixed with dried stearic acid and tungsten powder is placed in the welding head die, and then pressurized by a hydraulic press at 80 MPa / min to 250 MPa, and the pressure is maintained for 2 min to obtain a compact;

[0041] d. Sintering: Put the compact obtained in step c into a m...

Embodiment 3

[0047] A welding head for a high-hardness spot welder, made of the following raw materials: 25 parts stearic acid, 15 parts silver powder, 10 parts copper powder, 75 parts WO 3 Powder, surface coating material is 0.4 part WO 3 , 0.3 parts NiO and 0.3 parts VO 2 powder.

[0048] a. Ball milling: After weighing the raw materials according to the ratio, the stearic acid powder and tungsten powder are sequentially put into a high-energy ball mill for high-energy ball milling to obtain fine-grained powders of stearic acid and tungsten powder;

[0049] b. Drying: the fine-grained powder mixed with stearic acid and tungsten powder is dried in a vacuum drying oven;

[0050] c. Pressing: the fine-grained powder mixed with dried stearic acid and tungsten powder is put into the welding head die, and then pressurized by a hydraulic press at 75 MPa / min to 200 MPa, and the pressure is maintained for 2 min to obtain a compact;

[0051] d. Sintering: Put the compact obtained in step c into a molybdenu...

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Abstract

The invention provides a high-hardness welding head for a spot welding machine and a manufacturing method of the high-hardness welding head for a spot welding machine. The high-hardness welding head for the spot welding machine is made of 30-50 parts of stearic acid, 10-15 parts of Ag powder, 20-35 parts of Cu powder and the balance WO3 powder. The raw materials of a surface coating are composed of WO3, NiO and Cr2O3 powder. The manufacturing method of the high-hardness welding head for the spot welding machine comprises the following steps of ball milling, drying, pressing, sintering, infiltration, coating, reduction and sintering. The added Ag can improve the electricity conducting capacity of the welding head, reduce the loss of current and improve the work efficiency of the welding head, and therefore the economic benefits of tungsten-copper-silver alloy are improved; the nickel contained in a tungsten-nickel-vanadium coating can improve the welding strength; meanwhile, the nickelhas good acid-base tolerance and has good rust resistance and heat resistance at a high temperature, the vanadium in the coating has a high melting point, is hard in texture and excellent in air resistance, salt resistance and water resistance and is not oxidized in air, and therefore the actual service life of the welding head is prolonged.

Description

Technical field [0001] The invention relates to the field of welding head preparation for a spot welding machine, in particular to a welding head for a high-hardness spot welding machine and a preparation method thereof. Background technique [0002] The welding head is one of the most important parts of the spot welding machine, and the material of the welding head undoubtedly directly determines the quality of the welding head. Copper alloy is usually used as the material of the welding head, mainly because of its excellent electrical and thermal conductivity and processing Good performance. Among them, tungsten copper has the advantages of copper, and it also has the high melting point, high hardness, high temperature resistance, arc ablation resistance, high strength, high specific gravity, good electrical conductivity and thermal conductivity of tungsten. It is easy to cut and process, and has sweat Excellent characteristics such as cooling; undoubtedly an extremely suitable...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/22B23K35/40C23C4/11C23C4/134
CPCB23K35/222B23K35/402C23C4/11C23C4/134
Inventor 徐剑
Owner 宁国市顺鑫金属制品有限公司