Before we get into the thread big time, it's a good idea to add some details about your project. Material, type of welding (mig, tig, arc, oxy/acy, or w/e else makes you happy) brand/type of welder (ie. Miller Diversion), Shielding gas used if applicable (argon, CO2, etc.) type of rod or wire (flux core, s/s, aluminum) type of arc starter (Pure Tungsten, 2% Tungsten), any other details (backpurging, etc.) Try to use this format:
Material: Sch 30 Stainless Pipe
Welding Type: TIG
Welder Brand: Miller Diversion 165
Shielding Gas: Argon/CO2/Helium
Rod Type: Stainless 308
Tungsten Type: 2% (Red)
Mocked up a manifold for a big project.