What is heat treatment – Troubleinthepeace


Weld heat treatment is the process applied to weld joints with high strength base steel. Weld heat treatment processPost weld heat treatment) is applied after welding for the purpose of reducing residual stress, controlling the stiffness of the joint area and improving the service life of the bond. If you don’t do the work weld heat treatment After welding with some high-strength steels, residual stresses associated with in-service stresses may exceed the material’s ultimate stress. This leads to weld failure, risk of cracking or increased susceptibility to cracking.

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The effects of post weld heat treatment

Weld heat treatment can include many different types, but the most common are: Post heating and residual stress relief.

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Post-weld heating

Reduces cold cracking due to hydrogen. The welding process can cause hydrogen to overflow into the material and stay in the material. Heating (heat treatment) of the material after welding can diffuse hydrogen from the welding area thereby preventing hydrogen cracking. This process is carried out immediately after the welding process is completed. Instead of cooling The bond is heated to a certain temperature depending on the thickness of the material. And stays at this temperature for a number of hours depending on the thickness of the material.

Reduce residual stress(heat treatment)

Because the welding process can leave a residual stress in the material, increasing the possibility of corrosion and causing hydrogen cracking. Weld heat treatment can release these stresses and reduce the risk of corrosion. This process involves heating the material to a specific temperature and then gradually cooling it.

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Post weld heat treatment is applied to which materials?

Some materials require post-weld heat treatment (specified by specific standards). Some materials can be destroyed after heat treatment. Therefore, before applying the heat treatment process, it is necessary to consider specifically with each material and welding connection.

In general, the higher the carbon content in the material, the more heat treatment is required after welding. Similarly, with higher alloy content and greater thickness, the potential for heat treatment requirements increases.

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Here is an example ofweld heat treatment processwith Molybdenum alloy steel, with thermal cycling from partPreheat before weldingandheat treatmentafter welding.

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