I was able to get a few hits from this list at
https://www.archive.org
https://archive.org/details/metalworkenamell00mary
https://archive.org/details/weldershandbook00finc
https://archive.org/details/weldershandbookc00finc
This website has everything historic that people have taken the time to scan. Search until your heart's content. It contains all of the lost arts but searching can be troublesome. Do take the time to play around with the advanced searching or you will be overwhelmed.