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Casting welding process

A welding process and casting technology, which is applied in the field of welding process for cold welding and surfacing of castings, which can solve the problems of poor welding effect, poor working environment and high cost of hot welding, so as to reduce the source of pores and reduce welding man-hours , The effect of saving welding materials

Inactive Publication Date: 2019-07-09
常鑫
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor working environment of the thermal welding method, and the heating temperature is difficult to meet the requirements under many on-site conditions
However, the prior art methods for repairing castings by cold welding mostly have the problems of poor welding effect and high cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0011] Example: Wear repair of cast iron bearing seat of rough rolling final reducer.

[0012] (1) Clean up the parts to be welded: We use an oxyacetylene flame to bake the parts to be welded on a larger scale to remove the oil on the surface to be welded

[0013] Pollution, and play a role in the burning of casting loose pores and oily interlayer oil, and minimize the source of pores.

[0014] (2) Prepare welding rods: use E50157 basic welding rods with a diameter of 3.2 mm, dry the welding rods at a temperature of 360 °C for 2 hours, and put them in an insulated barrel for heat preservation after drying.

[0015] (3) Welding: DC electric welding machine is selected, and the DC positive connection method is adopted, that is, the welding rod is connected to the cathode, and the weldment is connected to the anode, and the current range is kept at 100 A. Because the surfacing welding is on the inner surface of a circular arc, segmental welding is used in the welding process, an...

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Abstract

The invention discloses a casting welding process that comprises the following welding process steps: (1), cleaning a to-be-welded part: eliminating defect factors such as greasy dirt and rust; (2), preparing a welding rod: drying the welding rod for 40 minutes at the temperature of 360-380 DEG C by using an E50157 alkaline welding rod with the diameter of 3.2 mm, and putting the welding rod intoa heat preservation barrel for heat preservation for later use after the welding rod is dried; and (3), welding: selecting a direct-current electric welding machine, adopting a direct-current positiveconnection method, that is, the welding rod is connected with a cathode and a weldment is connected with an anode, wherein the current range is kept about 95-105 A. According to the invention, the casting is welded by adopting a casting cold welding process, so that the problems that the working environment of a casting hot welding process is poor and the heating temperature is difficult to meetthe requirements of the hot welding process under many field conditions are solved, the welding time is shortened, and the welding material is saved.

Description

technical field [0001] The invention belongs to welding technology, in particular to a welding process for cold welding and overlay welding of castings. Background technique [0002] There are two methods of casting welding: hot welding and cold welding. The thermal welding method is to heat the casting as a whole or in a large area to 600-700°C and then start welding. The temperature of the workpiece during the welding process is not lower than 400°C, and it is heated to 600-700°C immediately after welding for stress relief annealing. The cold welding method is a method of welding and repairing castings when the overall temperature is not higher than 200 °C. Due to the poor working environment of the thermal welding method, and the heating temperature is difficult to meet the requirements under many on-site conditions. And the prior art carries out the method for cold welding repair to casting, mostly exists the problem that welding effect is not good, and cost is higher....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/235B23K9/02B23K9/32
CPCB23K9/02B23K9/235B23K9/32
Inventor 常鑫
Owner 常鑫
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