Tube end welding of Cr-Mo steel heat exchangers
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Must the preheating temperature for welding the tube ends of Cr-Mo steel heat exchangers be above 150°C? What heating method should be used? How to maintain the temperature during welding? If all of the above is ensured, the welder’s hands will still get extremely hot while welding
This post was last edited by wanlirn on 2020-5-1 20:52. Even if you’re panicking, you still have to weld it – are you already scared? Dry, hydrogenation; wear thick cotton coats in summer; welders – a new person takes over every 15 minutes, rotating shifts
It is essential to carry out preheating and post-heating, as well as control the temperature during welding. The welding process must be followed strictly; otherwise, cracks are very likely to occur! For the heating method, either flame heating or electric heating can be used; the key is to consider the effectiveness
Hydrogenation is fine – the diameter is large and there’s no direct contact with heat sources. I’ve been doing surfacing work for several years, and these days I don’t sweat at all in the summer:(
Is it safe to have direct contact with the tube sheet using hands for electric heating? Was the heating continued during the welding process or was it turned off?
During welding, insulating material can be used to cover the areas that are not being welded in order to maintain heat
Based on the questions raised, a preliminary analysis for beginners: take your time