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Method for welding cast iron by use of carbon dioxide gas

A carbon dioxide and gas technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve problems such as uneven hardness, inability to use large cast iron workpieces, inconsistent metal colors, etc., and achieve narrow heat-affected zone, small stress and deformation , low cost effect

Inactive Publication Date: 2009-12-16
CHONGQING JIANSHE MOTORCYCLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Brazing is only suitable for repairing small parts, and the color of the casting after welding is inconsistent with the welded metal, and the hardness is uneven.
Cannot be used for large cast iron workpieces

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Repair welding of cracks and defects in the base of the motorcycle fuel tank punch. The material is ductile iron, the grade is QT4-510. with CO 2 The method of gas welding cast iron has the following steps: First, thoroughly remove the damaged part of the cast iron, such as cracks, etc. The method of removal is: drill a crack stop hole at the end of the crack, and use a flat shovel, grinding wheel, etc. The slope should be determined according to the degree of crack damage of the weldment and the convenience of welding), the groove is processed into a V shape, and the groove surface is as smooth as possible. After cleaning, drill a crack stop hole at the crack terminal to prevent the crack from spreading. Clean up the oil near the groove to avoid air holes. If the cracks are not obvious, heat it with a flame to 200-300 degrees and cool it in the air naturally. The specific method is to heat it with a gas flame until it no longer emits smoke. Choose the wire with a di...

Embodiment 2

[0021] Ordinary Yuan car C620 bed seat fracture repair welding, the material is gray cast iron grade HT20-40. with CO 2 The method of gas welding cast iron has the following steps: First, thoroughly remove the damaged part of the cast iron, such as cracks, etc. The method of removal is: drill a crack stop hole at the end of the crack, and use a flat shovel, grinding wheel, etc. The slope should be determined according to the degree of crack damage of the weldment and the convenience of welding), the groove is processed into a V shape, and the groove surface is as smooth as possible. After cleaning, drill a crack stop hole at the crack terminal to prevent the crack from spreading. Clean up the oil near the groove to avoid air holes. If the cracks are not obvious, heat it with a flame to 200-300 degrees and cool it in the air naturally. The specific method is to heat it with a gas flame until it no longer emits smoke. Choose a material with a diameter of 1.0 mm and H08Mn2SiA ...

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Abstract

The invention relates to a method for welding cast iron by use of carbon dioxide gas. The method is characterized by comprising the following steps: 1) eliminating cracks on a repair welding part and drilling crack-stopping holes on the cracks at the ends of the cracks; 2) providing the repair welding part with a groove; 3) choosing welding wires 0.6 to 1.0 mm in diameter; and 4) using a CO2 gas method for welding. The method is suitable for welding large cast iron workpieces, and has the advantages of low production cost and good machining properties.

Description

technical field [0001] The invention relates to a welding process, in particular to a method for welding cast iron with carbon dioxide gas. Background technique [0002] At present, the repair welding technology of cast iron adopts traditional manual arc welding or brazing, and manual arc welding is usually used for large cast iron workpieces. In the welding process, due to the poor weldability of cast iron materials, if the welding rod is improperly selected or the heating, heat preservation, slow cooling and other processes are improperly selected during welding, a series of defects will occur during the welding process, such as white holes and cracks, etc., which are serious Sometimes the entire weld section will be whitened, and white cast iron is hard and brittle, making it extremely difficult to process. In addition, in order to facilitate mechanical processing, the welding wire of manual arc welding is made of rare metal nickel, so manual arc welding also has the dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16
Inventor 王小平
Owner CHONGQING JIANSHE MOTORCYCLE CO LTD
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