Welded layer issues
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The design party for one of our company’s equipment specified that there should be one layer of surfacing metal, but when we communicated with the manufacturing party, they said two layers were required. What is the difference between having one layer or two layers of surfacing metal on a container? This post was last edited by Lan Meng on 2009-3-5 08:20.]
It is the difference between electroslag surfacing and arc surfacing
The manufacturer primarily considers the need for a transition layer based on its own welding techniques, that is, a transition layer is applied first before the final layer
Take a look at the following: http://bbs.hcbbs.com/viewthread.php?tid=39755
Cladding generally involves welding of different steel types; to ensure the performance of the clad layer, manufacturers usually apply a transition layer first, and the base material of this transition layer melts to a greater extent
Since welding of different types of steel sometimes occurs, special attention is required; it is necessary to weld in two layers – the first layer serves as a transition, and the second layer is welded afterward. This also makes inspection easier. And sometimes welding doesn’t achieve perfection in one go; many urea devices are like this. I’ve dealt with such cases before
Electroslag cladding can achieve the required result with just one layer
Two layers should be welded by surfacing: a transition layer and a clad layer. The transition layer dilutes the base metal, while the clad layer ensures corrosion resistance.
It is best to have 2 layers (a transition layer + a surface layer), as this ensures that the surface layer possesses properties such as corrosion resistance or wear resistance, thereby achieving the purpose of surfacing. With only 1 layer, there is a problem of dilution (this issue does not arise if surfacing is done with the same material)
It is best to weld two layers, with the transition layer being diluted.
I think we also need to consider the height of the surfacing layer; if welding is performed again on this layer, the depth of the weld pool reaching the transition layer of the clad layer will affect the welding quality. No matter how many layers are used for surfacing, what’s important in the end is maintaining quality.
I heard that with pole welding, it’s possible to apply just one layer of weld to meet the requirements, without the need for a transition layer. Is that true? This post was last edited by sus321 on 2009-3-23 10:59]
The conventional approach is to use two layers: one layer for transition and another layer made of corrosion-resistant material