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A kind of aluminum-steel exothermic welding method

An exothermic welding, aluminum block technology, applied in aluminothermic welding equipment, welding equipment, welding medium and other directions, to achieve the effect of reasonable design, simple equipment and simple structure

Inactive Publication Date: 2016-04-27
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome various defects of the traditional aluminum-steel welding method, and provide an aluminum-steel welding method with simple equipment, easy operation, low cost and metallurgical combination of aluminum-steel welded joints

Method used

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  • A kind of aluminum-steel exothermic welding method
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  • A kind of aluminum-steel exothermic welding method

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Grind the sections of the aluminum block and steel block to be welded with the same cross-sectional area, and place a pre-polished steel sheet of moderate size between the aluminum block and the steel block to be welded. The cross-sectional shape of the steel sheet is an inverted triangle , the thickness is 3mm; the aluminum block and the steel block according to figure 1 As shown, it is placed under the graphite crucible, and the center of the gap is aligned with the through hole at the bottom of the graphite crucible; there is a graphite base under the aluminum block and steel block, and there is a graphite pad with a through hole between the aluminum block, steel block and the graphite crucible. The through hole at the bottom of the graphite crucible is blocked by a metal sheet. The mass percentages were 22% of Al powder (fineness of 200 mesh), 68% of Fe 2 o 3 powder, 7% Si powder and 3% CaF 2 Put the powder in a powder mixer, mix evenly to form flux, then put the...

Embodiment 2

[0029] Grind the sections of the aluminum block and steel block to be welded with the same cross-sectional area, and place a pre-polished steel sheet of moderate size between the aluminum block and the steel block to be welded. The cross-sectional shape of the steel sheet is an inverted triangle , the thickness is 3mm; the aluminum block and the steel block according to figure 1 As shown, it is placed under the graphite crucible, and the center of the gap is aligned with the through hole at the bottom of the graphite crucible; there is a graphite base under the aluminum block and steel block, and there is a graphite pad with a through hole between the aluminum block, steel block and the graphite crucible. The through hole at the bottom of the graphite crucible is blocked by a metal sheet. The mass percentages were 24% of Al powder (fineness of 200 mesh), 66% of Fe 2 o 3 Powder, 6% Si powder and 4% NaF powder are installed in a powder mixer, mix evenly to form flux, then put ...

Embodiment 3

[0031]Grind the sections of the aluminum block and steel block to be welded with the same cross-sectional area, and place a pre-polished steel sheet of moderate size between the aluminum block and the steel block to be welded. The cross-sectional shape of the steel sheet is an inverted triangle , the thickness is 3mm; the aluminum block and the steel block according to figure 1 As shown, it is placed under the graphite crucible, and the center of the gap is aligned with the through hole at the bottom of the graphite crucible; there is a graphite base under the aluminum block and steel block, and there is a graphite pad with a through hole between the aluminum block, steel block and the graphite crucible. The through hole at the bottom of the graphite crucible is blocked by a metal sheet. The mass percentages were 26% of Al powder (fineness of 200 mesh), 64% of Fe 2 o 3 powder, 5% Si powder and 5% KF powder in a powder mixer, mix evenly to form flux, then put the flux into a ...

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Abstract

The invention discloses an aluminum-steel heat release welding method. The method comprises the steps that to-be-welded sections of an aluminum block and a steel block are polished cleanly; a pre-polished steel sheet is placed to cling to the aluminum block between a gap of the to-be-welded sections of the aluminum block and the steel block; a bottom through hole of a graphite crucible is aligned to the center of the gap; a self-propagating welding flux is put into the graphite crucible; pyrophoric powder on the surface of the self-propagating welding flux is ignited; molten liquid generated by self-propagating welding flux reaction flows into the gap between the aluminum block and the steel block from the bottom small hole of the graphite crucible; the steel sheet is heated, molten, and cooled to a room temperature; and then aluminum-steel welding is accomplished. The adopted self-propagating welding flux comprises the following raw materials by mass percent: 22-28% of Al powder, 62-68% of Fe2O3 powder, 4-7% of Si powder and 3-6% of slag forming constituent. The method is simple to operate, simple in equipment, stable, safe and reliable in reaction, extensive in raw material, low in cost and less in joint slag inclusion, and has a great industrial popularization value; aluminum steel bonding adopts metallurgical bonding; and the quality is good.

Description

technical field [0001] The invention belongs to the technical field of material processing and manufacturing, and in particular relates to an aluminum-steel exothermic welding method. Background technique [0002] As a silver-white light metal, aluminum has excellent ductility and is also the most abundant metal element in the earth's crust, so it has important development prospects in the fields of aviation, construction, and automobiles. Due to its low price and reliable performance, steel has become one of the most used materials and is an indispensable component in construction, manufacturing and people's lives. Combining the excellent properties and application prospects of aluminum and steel, welding between aluminum and steel dissimilar materials has naturally become a hot spot. However, due to the very different properties of aluminum and steel, the melting point is very different, so it faces great technical challenges in actual welding. [0003] At present, in al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K23/00B23K35/362
CPCB23K23/00B23K35/361B23K2103/18
Inventor 张国栋邱智华张晖
Owner WUHAN UNIV