Excavator big forearm crack how to do? How to weld and repair cracks?

[DIG-DOG]

Excavator forearm cracking is a problem encountered by many digging friends, because it is the main working part of the excavator, basically every action must be stressed, although modern steel smelting technology has been very developed, but there is no steel that can not be deformed, torn, and worn under the action of various forces for a long time. So what exactly causes the cracking? And how do we fix it?
There are many reasons that lead to the big arm of excavatorcracking.

First, the use of digging bucket beyond the original bucket capacity. For example, a 10-ton excavator with a bucket of more than 20 tons will cause the large arm to be overloaded and cracked due to abnormal work, so each model should use a bucket corresponding to the original bucket.

Second, the driver's operation is wrong. Excessive force to dig hard heavy objects, hard digging, using the excavator as a crane, lifting heavy objects, etc., are all causes of the excavatorbig forearm cracking.

Third, the continuous long-term work load is too large, resulting in fatigue damage, especially in mining work, big arm cracking is more common, do not overload work for a long time.
The working load of the mine is large, resulting in the broken arm of the excavator is possible
So how to crack the big forearm of the excavator?
First, the welding must be cleaned before welding;
2. Preheat before welding;
Third, the appropriate welding materials must be selected when welding;
Fourth, welding must ensure that welding penetration;

It must be cleaned before welding, that is, the original cracked welding meat is removed, and the carbon arc gouging is used when the conditions are available, but the iron oxide must be polished after the gouging. If possible, it is also necessary to preheat the welding position by 100 degrees. Then weld with a diameter of 3.2J507 electrode, stop welding for a while, hit the weld and the edge of the weld with a hammer, and then hit the weld with a hammer until the weld is basically cool. The purpose is to release the welding stress, because it is not possible to do heat treatment after welding. When welding, it must be guaranteed that the welding is thorough. If the weld position gap is large, a backplane can be added inside.

The type of electrode is important. If you want to understand what the material then you have to take some iron foam test, a test out, and then according to the distribution of the electrode on the line. J507 electrode is enough, tensile strength of 50 kg, it is just a structural steel. If 507 you have used before and can guarantee welding penetration and crack, it is recommended that you change J607, it should be enough.
In general, because each excavatorfracture situation is not the same.

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