Welding issues?
Thread Content
Why must stainless steel welding electrodes be placed in an oven and heated to 260 degrees for 1 hour in advance?
Basically, it needs to be baked before use, and this is done to achieve a good weld structure
First of all, all welding electrodes need to be placed in an oven for drying in advance, not just stainless steel welding electrodes. Secondly, the purpose of baking is to dry out the moisture contained in the welding rod. Since the welding rod has a coating that provides protection during welding, if it is not pre-heated, not only will this protection be compromised, but water vapor can also cause defects such as pores in the weld.
After removing the moisture, the weld appears nice and there is no spatter.
Hydrogen is a harmful element in welds. 1. Using low-hydrogen or ultra-low-hydrogen welding electrodes is a direct method to reduce hydrogen content. Drying welding electrodes can effectively remove moisture (hydrogen) from the electrode coating ； 2. Preheating before welding can also remove some of the moisture from the base material ； 3. For some special materials, post-heating and controlled cooling with heat retention can effectively remove \"diffusion hydrogen\".
Reduce pores and cracks that occur during welding