What is the down hand method of welding?

Also referred to as a “downhand” position, the flat position weld is the easiest and often the first weld that new students learn. The metals to be joined are placed flat, and the welder passes the electric arc over them, moving across the workpiece in a horizontal direction.

What is the process of pipeline welding?

Pipeline Welding by Shielded Metal Arc Welding (SMAW) In SMAW the pipelines are welded by melting the electrodes with the heat generated by an electric arc. The number of passes required usually varies with the pipe thickness, electrode size, welding position, and the current used for pipeline welding.

What motions should be used in downhill welding?

A light dragging motion with a short arc is used when downhill welding with an E-7018 clectrode. 5. A 10° to 30° travel angle is recommended for downhill welding.

In what position should the electrode be held in downhill welding?

The centerline of the electrode should be held at a 45° work angle. As with welding on other joints in other positions, a travel angle of 5°–15° is a good angle to use.

What kind of pipes will be used when performing downhill pipe welding?

Pipe welding downhill is traditionally reserved for materials that are thin enough that the speed of movement required isn’t likely to cause weld formation defects like lack of fusion. A material thickness of 12.5 millimeters (0.49 inches) is generally considered the cutoff for effective downhill vertical welding.

What type of welding is used for pipelines?

arc welding
Pipe welding uses arc welding techniques, including shielded metal arc welding (SMAW), gas metal arc welding (GMAW) – including both MIG and MAG welding, flux-cored arc welding (FCAW), submerged arc welding, and tungsten inert gas (TIG) welding.

What are the 4 basic weld joints?

Understanding Different Welding Joint Types

  • Butt joint.
  • Tee joint.
  • Corner joint.
  • Lap joint.
  • Edge joint.

Do you weld pipe uphill or downhill?

Vertical uphill or downhill. Downhill progression is almost always used for speed. When welding uphill, you are “fighting” gravity, so your speed is slow. When welding downhill, gravity pulls the weld pool down, so it results in great speed.

What travel angle is recommended for downhill welding?

10°–25°
Downhill welding uses a drag travel angle of 10°–25°. A downhill root pass of a groove weld can be welded with a stringer bead or a weave bead.