Download Pipe Welding Procedures by Hoobasarl Rampaul PDF
By Hoobasarl Rampaul
A regular reference for many years, this new version of Pipe Welding systems maintains to enhance the welder's realizing of methods. Drawing on his wide sensible and instructing event within the box, the writer describes intimately the manipulating methods used to weld pipe joints. you'll find beneficial info on warmth enter and distribution, necessities of shielded metal-arc expertise, distortion, pipe welding defects, welding defense, necessities of welding metallurgy, and qualification of the welding method and the welder.
Look for brand spanking new or elevated insurance of:
* Root Bead--Pulse Current--Gas Tungsten Arc Welding
* Shielded steel Arc Welding—Electrode
* Welding metal for Low Temperature (Cryogenic) Service
* Down Hill Welding—Heavywall and big Diameter
* Welding Metallurgy
* Weld fix
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Additional info for Pipe Welding Procedures
Example text
There it enters the puddle and flows into the root opening. As the electrode moves on, the molten metal in the puddle that is left behind solidifies to form the weld bead. Since the bead will be deposited in a circular pattern around the pipe, the tilt of the electrode must be changed gradually to maintain the correct electrode angle. If the keyhole size becomes too small, the electrode angle should be decreased slightly by pointing the electrode more directly toward the keyhole. Also, the welding speed may be decreased slightly.
When welding a single-vee groove, open butt joint in the flat (l G) position, the molten metal will tend to drip through the opening causing the bottom of the weld to build up and form a high crown. This is excessive penetration. In more severe cases, burn-through will result, especially if the current setting is too high. In some shops, back-up plates are positioned at the bottom of the joint to prevent this from happening. However, this is not necessary when the weld is made by a skilled welder, using the whipping procedure and the correct current setting.
The weave should be made by smooth and precise movements of the wrist. The arc should be brought out of the puddle and up along the bevel with a quick movement. Allowing just enough time for the puddle to lose some of its fluidity by slowing down the return movement, the arc is returned to the puddle and held there for a short pause. This movement is then repeated up and along the other bevel. The liquid metal must never be allowed to solidify during the weave. Some of the slag may also solidify and, if this occurs along Fig.