I used to think a certain way about welding on old boiler tubes, but last Tuesday changed my mind

We were on a job at the old paper mill in Bellingham, replacing a bundle. The specs called for a specific rod, but my lead hand, Carl, insisted we should preheat more than the book said, like his old foreman taught him. I argued it was a waste of time on this alloy. Well, we did it his way on a test section. When we did the bend test later, my weld passed but his was perfect, no hint of cracking at all. The difference was clear as day. He said, 'The book knows the metal, but it doesn't know this particular forty years of stress cycles.' That stuck with me. I guess some old school tricks have their place after all. Has anyone else had a similar moment where experience beat the manual on an old system?

2 comments

2 Comments

reese5501mo ago

So how much extra preheat did Carl end up using, and did it change your approach for the rest of that bundle?

spencerw721mo ago

The book knows the metal, but it doesn't know this particular forty years of stress cycles." Man, that's the kind of line that makes you want to throw the manual right in the trash. So I guess the real textbook was the friends we made along the way, or in this case, the cracks we didn't make. Sounds like Carl's old foreman saved you a world of callbacks.