Welding Cast Iron in China
- Author Galen Wang
- Published June 23, 2011
- Word count 391
In an iron foundry in China, welding cast iron has been widely used. Such as repairing iron casting defects or used in welded assembly parts for fabrications.
Welding cast iron is used in various places like housing, brake drums, counter weights, pipe fittings, making enclosures, machine forms and bases, and clutch plates etc.
Welding cast iron is a very dedicated works. There are many important issues that need to be paid attention to.
Firstly, cleaning the cast iron to be welded, then takes place with the help of a degreaser. When welding a small crack then the beginning and the ending point of the crack has to be determined while welding it. A stop hole should also be done of one eight inch by drilling at each end of the crack, sand paper can be used for grinding and a magnifying glass is also needed to see the hole done. The length of the crack has to be grounded by a V shape, taking care of not going through all the way through the cast iron.
In addition, the temperature is very important to the welding quality of cast iron. The whole cast iron material should be pre-heated and to be welded through 500 degree. The ambient temperature has to be cooled down and it is a very important procedure in welding. it should be then place on a hot oven. The temperature should be maintained constantly from fifty to sixty degree per hour so that the air temperature is reached.
Same method has to be followed when ever there are two pieces to be cast iron or a crack to be welded. The material gets cool really soon in open air, so to avoid that it is very important for a welder to make sure that the materials are pre- heated and cool down slowly.
Finally, the welders should always use the right and apt welding equipments so that welding is done with proper format and also follow all the rules and regulation of welding cast iron to get the right weld which will not crack and stay last long.
In China, most of iron foundries could do the welding works to cast iron in-house. But most of them just take it as the repairing methods.
This article was from Dandong Foundry. For the whole article, please check Dandong Foundry Blog.
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