Repairing method of gray pig iron heterogeneous welding line

A repair method and technology for gray cast iron, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of gray cast iron castings that are not easy to repair, insufficient weld strength, and low weld plasticity. Welding stress, effect of good machinability

Inactive Publication Date: 2019-02-19
ANHUI MASTEEL ENG & TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to overcome the characteristics of existing gray cast iron castings that have defects such as cracks that are not easy to be repaired, and the welding seam has low plasticity or insufficient weld seam strength during the welding repair process, and provides a repairing method for gray cast iron heterogeneous weld seams Method; the repair method of a gray cast iron heterogeneous weld o

Method used

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  • Repairing method of gray pig iron heterogeneous welding line
  • Repairing method of gray pig iron heterogeneous welding line
  • Repairing method of gray pig iron heterogeneous welding line

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Embodiment 1

[0047] Such as figure 1 Shown is a flow chart of a method for repairing a gray cast iron heterogeneous weld according to the present invention. In the method for repairing a gray cast iron heterogeneous weld in this embodiment, the repair steps are as follows:

[0048] Step A: Cleaning and preparation work before welding;

[0049] Step A 1 : Remove debris on castings and defects;

[0050] Step A 2 : remove oil stains on castings and defects, the method for removing oil stains on castings and defects is scrubbing with alkaline water or gasoline scrubbing or removing with gas welding flames to avoid pore defects;

[0051] Step A 3 : Observing crack defects and performing preliminary treatment on crack defects;

[0052] Step A 31 : measure the length of the crack defect;

[0053] Step A 32 : Make the crack defect into a groove, which is beneficial to welding;

[0054] Step A 33 : Drill a crack stop hole 3mm away from the end of the crack, the diameter of the crack stop ho...

Embodiment 2

[0059] Such as figure 1 Shown is a flow chart of a method for repairing a gray cast iron heterogeneous weld according to the present invention. In the method for repairing a gray cast iron heterogeneous weld in this embodiment, the repair steps are as follows:

[0060] Step A: Cleaning and preparation work before welding;

[0061] Step A 1 : Remove debris on castings and defects;

[0062] Step A 2 : remove oil stains on castings and defects, the method for removing oil stains on castings and defects is scrubbing with alkaline water or gasoline scrubbing or removing with gas welding flames to avoid pore defects;

[0063] Step A 3 : Observing crack defects and performing preliminary treatment on crack defects;

[0064] Step A 31 : measure the length of the crack defect;

[0065] Step A 32 : Make the crack defect into a groove, which is beneficial to welding;

[0066] Step A 33 : Drill a crack stop hole 5mm away from the end of the crack, the diameter of the crack stop ...

Embodiment 3

[0071] Such as figure 1 Shown is a flow chart of a method for repairing a gray cast iron heterogeneous weld according to the present invention. In the method for repairing a gray cast iron heterogeneous weld in this embodiment, the repair steps are as follows:

[0072] Step A: Cleaning and preparation work before welding;

[0073] Step A 1 : Remove debris on castings and defects;

[0074] Step A 2 : remove oil stains on castings and defects, the method for removing oil stains on castings and defects is scrubbing with alkaline water or gasoline scrubbing or removing with gas welding flames to avoid pore defects;

[0075] Step A 3 : Observing crack defects and performing preliminary treatment on crack defects;

[0076] Step A 31 : measure the length of the crack defect;

[0077] Step A 32 : Make the crack defect into a groove, which is beneficial to welding;

[0078] Step A 33 : Drill a crack stop hole 4mm away from the end of the crack, the diameter of the crack stop ...

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Abstract

The invention discloses a repairing method of a gray pig iron heterogeneous welding line. The method comprises the steps of preweld cleaning preparing, welding current selecting, adopting the heterogeneous welding material EZNiFe for gray pig iron cold welding, postwelding hammering and the like. The repairing method of the gray pig iron heterogeneous welding line is provided for overcoming the defects that an existing gray pig iron casting generating cracks and other defects is not prone to being repaired, in the welding repair process, the welding line plasticity is low, and the welding linestrength is poor; the repairing method of the gray pig iron heterogeneous welding line mainly uses the heterogeneous welding material EZNiFe for gray pig iron cold welding, the welding line plasticity is improved while it is ensured that the welding line strength is not reduced, the white cast of the welding line is reduced, the casting obtains the good cutting machining property, and the traditional gray pig iron welding line is converted into the heterogeneous welding line from the homogenesis welding line.

Description

technical field [0001] The invention belongs to the technical field of casting repair in mechanical manufacturing, and in particular relates to a repair method for heterogeneous weld seams of gray cast iron. Background technique [0002] At present, heavy machinery companies such as steel mills produce a large number of castings every year. These castings will be damaged to varying degrees during use. If cracks appear, the products will be scrapped. If a new one is replaced, it will be impossible to purchase it in a short period of time, which will seriously affect production, and some castings will be machined, and the price is very expensive. If it can be repaired by welding in time, it will not only save time, but also save a lot of money. At present, the commonly used grade of gray cast iron is HT-200. The chemical composition of this material is characterized by high carbon and high content of sulfur and phosphorus impurities. Traditional welding materials use "Z248" a...

Claims

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Application Information

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IPC IPC(8): B23K31/02B23P6/04
CPCB23K31/02B23P6/045
Inventor 张汪林吴志华
Owner ANHUI MASTEEL ENG & TECH GRP
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