root pass

root pass

[′rüt ‚pas]
(metallurgy)
The first weld bead deposited in a multiple pass weld. Also known as root sealer bead.
References in periodicals archive ?
Tenders are invited for Fabrication of structural steel items involves gas cutting & grinding as per required dimensions, marking & drilling of holes, edge preparation by grinding, fit up & welding of structural steel items, dye penetrant inspection of root pass and final pass of welding, erection of structural items, handling of structural steel items from departmental stores, cleaning by wire brush/ buffing, painting with one coat of red oxide primer paint and one coat of enamel paint
Nicholson: Lincoln Electric is renowned worldwide so I guess when I picked up my first Fleetweld 5P back in the late '80s to put in a root pass would be the start of my pipelining career.
For the root pass, since this is the first weld pass to be made, argon gas is used as backing gas on the pipe interior diameter to displace all oxygen from atmospheric air.
Vertical Up Welding face a welding speed reduction of 60-70 per cent when welding the same root pass with basic vertical-up electrodes.
A DC arc is normally used for the root pass to achieve full penetration.
0402-20 GTAW Root Pass Welding of 6% Molydenum Austenitic Stainless Steel Pipe--Open Root Joint with Hand-fed Filler.
Contract award notice: construction of water supply and sewage in the streets: root pass, wiosnianej, side, sons regiment and popieluszki in lodz.
Welders can complete a root pass using STT[R] and then switch to a different welding process for the fill and cap when using an advanced multi-process welding power source like the company's Power Wave[R] 455M/STT[R].
TIP 0402-20 "GTAW root pass welding of 6% molybdenum austenitic stainless steel pipe--open root joint with hand-fed filler"
Contract notice: Construction of water supply and sewage in the streets: root pass, wiosnianej, side, sons regiment and popieluszko in lodz.