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Concerns of steam during welding on steel plate embed in concrete

Concerns of steam during welding on steel plate embed in concrete

Concerns of steam during welding on steel plate embed in concrete

(OP)
Hello all,

We have a contractor who is concerned that his welding on a steel embed plate, in technically uncured concrete (several days cure vice months), would cause steam generated from heat under the plate may damage or pop the plates.  Is there a method to welding, etc. to avoid possible steam from "green" concrete slabs during welding?  The plate is 12" square and will need to have a continuous 3/8 bead welded around it to join a post sitting on it.  The weld is not going to be structural, just to join the post to the embed, weight bearing is in down direction only.  

RE: Concerns of steam during welding on steel plate embed in concrete

Weld in small increments and then skip around to other side and repeat.

RE: Concerns of steam during welding on steel plate embed in concrete

I've welders build a little damn around the plate and run small water stream to keep the plate cool.  

RE: Concerns of steam during welding on steel plate embed in concrete

water and welding? most likely not going to be structural

RE: Concerns of steam during welding on steel plate embed in concrete

Have your contractor consider the use of a fast-setting cement in his concrete mix.  Some pre-packaged mixes can achieve earlier hydration, making for less available water to produce steam. But skip-welding as mentioned earlier is also a practical way to lessen the heat input on the plate.  Incidently, concrete doesn't have to be "green" to blow-out from heat application, just having enough free water available will make it happen.  I've seen more than a few overpass bridges destroyed from tanker truck fires underneath.

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