I do not weld so I cannot say whether this pencil works for that application. I bought it because I thought having a pencil that wrote in a silver color would be fun to experiment with. I haven't used it but a couple of times, just checking it out. The lines don't show up as well on some surfaces, but it's more noticeable on a dark surface. Unless you really have a need for something like this for everyday use, it's not an essential purchase item. It is good for the price, however.