Thick Terminology Question

[Andy from Workshopshed]

Was reading an article on welding thick panels for submarines this morning.

http://eandt.theiet.org/magazine/2011/10/a-touch-of-class.cfm

They mentioned that the first pass against a ceramic backing rod was the "route run", I always thought it was the "root pass". Is this US vs UK terminology or perhaps a typo on the article?

An interesting point to note is that they use fluxed filler and argon/CO2 shielding gas in their MIG welding of the panels.

 

[backpurge]

Standard practice is to use ceramic backing tiles for the root run and to weld this sort of structure with flux cored wire, the majority of flux cored wire uses an argon +20% CO2 shielding gas

 

[Andy from Workshopshed]

Thanks for the clarification, the question was really "is it route or root"

 

[KemppiFrog]

Root, as in the lowest part?
KF

Route makes little sense.

 

[Hitch]

Spelling mistake, that is.

 

[jackjosh]

I served my time building submarines. You would double chamfer the plate leave about a 10mm gap between the two noses, foil tape in a glass rod and then weave over the top using flux cored wire (Root run). It gave a nice finish and meant the back only needed grinding and not gouging to prep it