[plain ol Bill]

Two boilermakers buddy welding a reheat tube. Note how tight the space is. This is the cap so they have a TIG root in, filled and capped w/ 8018 or 9018. Reheats can have 3-4 metal combinations according to the place in the row and elevation. These are some of the easier tubes to weld in a boiler. That is likely a 2 1/2" dia. x .220 wall. Personally I NEVER relit a used rod. Always grab a new one cause the company is buying them and it lessens the chance of porosity on the pick up.
https://www.youtube.com/watch?v=lM-fdhnjlTg

[weldingt]

Looks like a ton of fun. The ones where you can get someone on both sides are usually better than the ones that have to be airbagged and welded one side at a time. Good fun though.

[weldin mike 27]

Is that similar to where they cut a window in the pipe and weld it from inside?

[weldingt]

Mike, Whenever possible they try to avoid window welds. In tangent tube furnaces with welded membrane, window welds are necessary. Than furnace design is not common.

The tubes I was spoken of were those where you could only weld one side at a time. Sometimes scaffold or boiler configuration prevents you from being able to get to both sides at once.

Old page on one of my old sites about window welds.
http://www.weldingdata.com/WindowWelds.htm

[weldin mike 27]

Awesome. I think its done it AUS a bit, but we can be a bit backwards here. Plus few new power stations have been built here in recent years. (in Victoria anyway)

[plain ol Bill]

Most boiler inspectors (Hartford especially) really frown on window welds. The only window welds we ever put in were on some radiant reheat tubes that had zero clearance to water wall tubes on one side. Combustion boiler design. Hated working on those damn radiant tubes.

[weldin mike 27]

Thanks for the information. I'm not versed in power station or boiler stuff, so it's all just observation.

[weldingt]

They were used commonly in Black Liquor Recover boilers in paper mills. I never encountered the need fir a window weld in a power boiler however my experience is only mine.

In the cases where I was involved, they were always composite tubes. 300 series ss over SA210-A1 core.

[weldin mike 27]

I'll post it on my other page, to get a feel for how common it actually is here. Someone should know.

[GreinTime]

Go to sleep micky

[Otto Nobedder]

Go to sleep micky

Go back to sleep, Sam,

It's AM in Oz, as he posts this.

"Worldwide forum."

Steve S

[weldin mike 27]

According to my sauces...(BBQ and tomato) it is common here in AUS, both for repairs and (apparently) close outs where the final lot of tubes are welded in, cutting off access.

[GreinTime]

I know. I normally messaged him on Facebook as he was getting home from work lol