That all depends vwbeetle, they are alwyas after folk who have a broad skill set. They rarely recruit specifically for a tradesman like that, but if you are a coded welder then they would definately have a use for you, depending on what sort of work you would take and your location. If you plumb for an offshore position, then your role will be multi-purpose anyway and welding will be something you won't do too often. However, the very fact that you can weld means that you already have a good skill set which can be built upon, which is something which would put you in good stead for a job should you apply.
One had better check ones self before one subsequently wrecks one's self.