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Repair welding process for nodular cast iron roller

A ductile iron and repair welding technology, applied in the field of cast iron, can solve the problems affecting the normal use of ductile iron rolls, short service life of ductile iron rolls, large repair welding deformation and residual stress, etc., so as to reduce repair welding deformation and residual stress. , high reliability repair, repair speed effect

Inactive Publication Date: 2020-05-19
HUBEI TENGSHENG TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the current repair welding processes only weld the cracks on the surface of the nodular cast iron roller, but the welding quality of this method is poor, resulting in a short service life of the nodular cast iron roller under high-strength conditions, large repair welding deformation and residual stress, affecting Normal use of ductile iron rollers

Method used

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  • Repair welding process for nodular cast iron roller
  • Repair welding process for nodular cast iron roller

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A repair welding process for a nodular cast iron roller, comprising the following steps:

[0028] S1. Use a grinder to grind along the cracks on the nodular cast iron roller to the depth of the inner wall to remove crack defects, and perform coloring flaw detection to ensure that all cracks are removed;

[0029] S2. Grinding the position to be repaired after the crack is removed until it is polished into a welding groove of a predetermined size;

[0030] S3. According to the shape and length of the crack, prepare a suitable welding backing plate;

[0031] S4. Partially preheat the nodular cast iron roller with an oxy-acetylene neutral flame. The preheating temperature is set to 50°C. Use two baking guns to heat the inner and outer walls of the nodular cast iron roller evenly at the same time. The outer baking gun moves slowly and uniformly, and the flame flame The distance between the center and the nodular cast iron roller is 10mm, and the internal baking gun is alway...

Embodiment 2

[0036] A repair welding process for a nodular cast iron roller, comprising the following steps:

[0037] S1. Use a grinder to grind along the cracks on the nodular cast iron roller to the depth of the inner wall to remove crack defects, and perform coloring flaw detection to ensure that all cracks are removed;

[0038] S2. Grinding the position to be repaired after the crack is removed until it is polished into a welding groove of a predetermined size;

[0039] S3. According to the shape and length of the crack, prepare a suitable welding backing plate;

[0040] S4. Partially preheat the nodular cast iron roller with an oxy-acetylene neutral flame. The preheating temperature is set to 55°C. Use two roasting guns to heat the inner and outer walls of the ductile iron roller evenly at the same time. The outer roasting gun moves slowly and uniformly, and the flame flame The center distance of the ductile iron roller is 30mm, and the internal baking gun is always heated on the inn...

Embodiment 3

[0045] A repair welding process for a nodular cast iron roller, comprising the following steps:

[0046] S1. Use a grinder to grind along the cracks on the nodular cast iron roller to the depth of the inner wall to remove crack defects, and perform coloring flaw detection to ensure that all cracks are removed;

[0047]S2. Grinding the position to be repaired after the crack is removed until it is polished into a welding groove of a predetermined size;

[0048] S3. According to the shape and length of the crack, prepare a suitable welding backing plate;

[0049] S4. Partially preheat the nodular cast iron roller with an oxy-acetylene neutral flame. The preheating temperature is set to 60°C. Use two roasting guns to heat the inner and outer walls of the ductile iron roller evenly at the same time. The outer roasting gun moves slowly and uniformly, and the flame flame The center distance is 50mm from the nodular cast iron roller, and the internal baking gun is always heated on t...

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Abstract

The invention discloses a repair welding process for a nodular cast iron roller. The repair welding process comprises the steps of 1, grinding and carrying out penetrant inspection; 2, grinding to form a welding groove with a preset size; 3, preparing a matched welding backing plate; 4, preheating; 5, welding and polishing; and 6, detecting. According to the repair welding process for the nodularcast iron roller, the depth of a crack is checked, the trend and length of the crack are comprehensively considered, and the welding backing plate and nodular cast iron powder are used as welding materials, therefore, the welding process is simple, the repairing speed is high, and the comprehensive cost is low; the welding process is strictly controlled conveniently, so that the repair welding quality is improved, and the use of the nodular cast iron roller under a high-strength working condition is guaranteed; the nodular cast iron roller can be quickly repaired, and the operation of the nodular cast iron roller is quickly restored; and meanwhile, the repair welding deformation and residual stress are greatly reduced, rapid and high-reliability repair of the crack of the nodular cast ironroller can be achieved.

Description

technical field [0001] The invention relates to the technical field of iron castings, in particular to a repair welding process for nodular cast iron rollers. Background technique [0002] When welding ductile iron rollers, cracks are prone to appear, which will seriously affect the quality of welding. There are two situations for the occurrence of cracks: the first is weld cracks, which are mainly due to the fact that the strength of the weld is lower than that of the base metal, and the plasticity is poor, and the cracks are generated under the action of welding stress; the second is cracks in the fusion zone, the main reason is The strength of the weld metal is higher than that of the base metal, and under the action of welding stress, cracks occur along the fusion line. In order to prolong the service life of the product and reduce economic loss, it is necessary to repair the cracked ductile iron roller. [0003] Most of the current repair welding processes only weld t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P6/04
CPCB23P6/04
Inventor 陈明华张鼎毅
Owner HUBEI TENGSHENG TECH LLC
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