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Self-propagating welding powder

A self-propagating welding and welding powder technology, applied in welding equipment, welding media, welding/cutting media/materials, etc., can solve the safety threats of construction personnel, reduce welding heat, and copper oxide is easy to absorb moisture and agglomerate, etc.

Inactive Publication Date: 2013-05-01
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The welding process is too violent, which may easily cause splashing of high-temperature molten metal and pose a threat to the safety of construction personnel;
[0005] 2. The copper oxide in the welding powder is easy to absorb moisture and agglomerate during storage and use. While reducing the welding heat, defects such as pores are prone to appear in the weld

Method used

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  • Self-propagating welding powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] First, use a precision electronic scale to weigh various powders according to the following proportions:

[0023] Barite 40% 500 mesh

[0024] Al 15% 500 mesh

[0025] Cu 38% 200 mesh

[0026] CaF 7% 400 mesh

[0027] When starting welding, put the copper cable 2 into the small hole under the mold, and reserve a space of about 5mm between the two copper cable wires. Preheat the copper cable after putting it in, and the final preheating temperature is 300°C to 400°C. Then the above powders are evenly mixed together according to the specified ratio. Place a self-fusing plug (thin copper sheet) at the bottom of the graphite crucible 1, then put the mixed self-spreading solder powder 4 into the crucible 1, and evenly sprinkle a layer of gunpowder 3 on the solder powder. After the gunpowder 3 is ignited, the gunpowder can cause the welding powder 4 to start to react, and the reaction continues. When the powder reaction is completed, the reaction product is the mol...

Embodiment 2

[0030] First, use a precision electronic scale to weigh various powders according to the following proportions:

[0031] Barite 50% 200 mesh

[0032] Al 30% 200 mesh

[0033] Cu 15% 50 mesh

[0034] CaF 5% 400 mesh

[0035] When starting welding, put the copper cable 2 into the small hole under the mold, and reserve a space of about 5mm between the two copper cables. Preheat the copper cable after putting it in, and the final preheating temperature is 300°C to 400°C. Then the above powders are evenly mixed together according to the specified ratio. Place a self-fusing plug (thin copper sheet) at the bottom of the graphite crucible 1, then put the mixed self-spreading solder powder 4 into the crucible 1, and evenly sprinkle a layer of gunpowder 3 on the solder powder. After the gunpowder 3 is ignited, the gunpowder can cause the welding powder 4 to start to react, and the reaction continues. When the powder reaction is completed, the reaction product is molten coppe...

Embodiment 3

[0038] First, use a precision electronic scale to weigh various powders according to the following proportions:

[0039] Barite 45% 200 mesh

[0040] Al 23% 200 mesh

[0041] Cu 25% 200 mesh

[0042] CaF 7% 400 mesh

[0043] When starting welding, put the copper cable 2 into the small hole under the mold, and reserve a space of about 5mm between the two copper cables. Preheat the copper cable after putting it in, and the final preheating temperature is 300°C to 400°C. Then the above powders are evenly mixed together according to the specified ratio. Place a self-fusing plug (thin copper sheet) at the bottom of the graphite crucible 1, then put the mixed self-spreading solder powder 4 into the crucible 1, and evenly sprinkle a layer of gunpowder 3 on the solder powder. After the gunpowder 3 is ignited, the gunpowder can cause the welding powder 4 to start to react, and the reaction continues. When the powder reaction is completed, the reaction product is molten copp...

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Abstract

The invention relates to self-propagating welding powder, which is prepared from the following raw materials according to mass percent: 15 to 30% of aluminium powder, 30 to 40% of copper powder, 40 to 60% of barite powder and 4 to 7% of calcium fluoride. The copper powder is melt to form molten metal of high temperature using a lot of heat generated by the oxidation-reduction reaction of the aluminium powder and the barite powder; and the molten copper of high temperature is adopted to weld the fillers of a weld groove. The aluminum oxide generated by reaction is combined with silicon dioxide and calcium fluoride in barite to promote the molten metal and slag to be separated. The reaction process is stable and a good welding effect can be achieved during exothermic welding.

Description

[0001] technical field [0002] The invention relates to a novel self-propagating welding powder formulation for exothermic welding, which belongs to the field of welding materials. Background technique [0003] The self-propagating welding method is a welding method that does not require electricity but relies purely on chemical reaction heat to provide energy. At present, it has been widely used in field operations, emergency rescue, and welding under strong magnetic fields. Compared with conventional arc welding technology, self-propagating welding has the following incomparable advantages: (1) The current carrying capacity of the fusion point is the same as that of the conductor, with good electrical conductivity, and the change rate of the DC resistance ratio before and after welding is close to zero. This is unmatched by any traditional connection method. (2) This welding technology is a real molecular welding, the conductor will not be destroyed and there is no conta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/34
Inventor 张国栋何致敏蒙雪健胡玉华
Owner WUHAN UNIV
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