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Cast iron welding technique using cold welding and bead welding

A welding process and cold welding technology, which is applied in the field of welding process for cold welding and surfacing of castings, can solve the problems of poor working environment, high cost, and difficulty in meeting the heating temperature requirements of thermal welding, so as to reduce welding hours and save energy. The effect of welding materials

Inactive Publication Date: 2011-04-06
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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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

[0009] Example: Abrasion repair of the cast iron bearing seat of the rough rolling final reducer.

[0010] A high-speed line factory carried out year-end maintenance, and one of the key items was the treatment of the wear of the cast iron bearing seat of the rough rolling main reducer. Because the cast iron bearing seat is worn by long-term load, the sound is abnormal during operation. The spot inspector can enter the inside of the reducer from the viewing hole on the top of the reducer, and use a feeler gauge to measure the gap between the inner circle of the bore of the output end of the driving gear and the bearing to 0.8mm. The main reducer of Gaoxian Factory is an old equipment that reuses old equipment. The gray cast iron bearing seat has been working under high temperature and stress for a long time, resulting in wear and tear. The casting weighs four to five tons and is worth 400,000 yuan. There are no spare parts in the warehouse. In the past, heat welding was used f...

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Abstract

The invention disclose a cast iron welding process using cold welding and bead welding, comprising the following welding process steps of: (1) clearing parts to be welded: removing oil stains, iron rust and other flaws; (2) preparing a welding rod: using an E5015 basic welding rod of which the diameter is 3.2mm, drying the welding rod at a temperature from 360 DEG C to 380 DEG C for 1 to 2 hours, putting the dried welding rod in a thermal insulation bucket, and preserving heat for later use; (3) welding: selecting a direct current welding machine, and adopting a direct current straight polarity method, namely that the welding rod is connected with a negative electrode, a component to be welded is connected with a positive electrode, and the current is kept in a range from 95A to 105A. In the invention, a casting is welded by adopting the casting welding process using a cold welding method. The welding process using cold welding and bead welding solves the problems that the work environments of a casting welding process using a hot welding method are poor, and the site heating conditions can not meet the requirements on the welding process using a hot welding method in most conditions. Welding time is shortened, and welding materials are 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 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): B23K31/02
Inventor 艾爱国邱福祥周武欧勇罗松云
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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