A lot of welding and fabrication jobs will be with small or medium companies who don't tend to advertise on the big sites. I would suggest that you get in touch with a recruitment agency in your area, ideally one specialising in industrial work.
The jobcentre site can also be good for industrial jobs.
I think my website is the only site that has every Welder Fabricator Job in the uk added daily, (over 250+ new jobs each day in UK) i've not seen any website similar (I don't want to break forum rules by posting the site, but its in my profile )
Handy if your Looking for work and made as a result of requests like yours and other welding friends who were looking for work