Most material being welded to 2205 including itself, should be welded with 2209 filler wire.
I have not welded P22, but from what I read it is a low allow stainless that tends to get brittle. The welding techniques specified include a pre and post heat treat and on thicker materials a buffer layer of 316L with the final joint of 309 not sure what p22 pipe is but if it is carbon you should use a 308L filler with 100% argon purge 308L is a filler for fusing carbon steel and non carbon stainless. If it were 316 stainless you would want to use a 319 filler P22 is a steel alloy containing 2 1/4% chromium. It is weldable with most carbon steel alloy fillers such as E-70s2, ER-7018, etc. However, to weld it to a low grade stainless steel alloy such as 304, you would need to use a bi-metal welding alloy such as E-309, or ER-309. The above answer is incorrect regarding 308L being a filler for carbon steel to stainless steel. It is in fact 309 which is used for dissimilar metal welding when one component is stainless steel. I have also had good success welding two dissimilar metals together using inconel alloy welding electrodes such as INCO-182.
Tgs 50
dissimilar steel grades and the unknown grade ss can easily welded with the help of 680CGS lnt welding electrode
A light pipe is a type of tube that is used to disperse or shift light.Light pipe can be used to send natural sunlight into a building they can be used to create artificial light within any type of structure.
Schedule 40
This is hard to answer with out knowing what type of metal. what the pipe is being used for, the amount of pressure that may be not the pipe.
It is the THINNEST ply of copper pipe and is ONLY used for heating purposes like baseboard heating!
B-vent pipe.
Coated Copper Pipe that is approved for underground only.
Brazing is a process used to join two metal pieces together The filler metal used for joining is heated above the melting point and poured over the base metals or pipes.
EMT (Electro-metallic tubing) is generally used in pipe-framed fences. This is the solid-wall conduit that electricians use, generally 1.5 to 3 inch diameter.