I think you mean root pass. An example would be when butt welding two pieces of plate together (end to end). You would grind a bevel (angle) along the edge of each plate so when you put them end to end there is a small gap between them except at one small point at the bottom. This gap will be filled with molten weld metal to fuse the two plates. Typically, this gap cannot be filled up by one pass with the weld electrode. The welder will go back and forth along the plate eventually filling the entire gap. The "root pass" is simply the first pass the welder makes.
roster welding
One type of welding is tube welding. Another type if mig welding.
SAW welding is a type of arc welding while ERW welding is spot or seam welding. SAW stand for submerged arc welding while ERW stands for electric resistance welding.
smaw welding is sheilded metal arc welding
what is the difference between ultrasonic welding & radiographic welding
roster welding
One type of welding is tube welding. Another type if mig welding.
SAW welding is a type of arc welding while ERW welding is spot or seam welding. SAW stand for submerged arc welding while ERW stands for electric resistance welding.
smaw welding is sheilded metal arc welding
what is the difference between ultrasonic welding & radiographic welding
Mainly In spot welding & resistance welding two type welding machines are used :- 1. Air Cooled & 2. water Cooled.
CS Welding is known as Carbon Steel welding that is more beneficial and easy to use for welding purpose.
Digital Control of welding when welding
Welding Electrorodes or Welding Rods are used in arc welding. Arc welding is a special type of welding which uses a welding power supply to create an electric arc between the base material (e.g. steel) and the electrode. The Welding Ectrorodes can be used for all weldable aluminum and mild steel.
Transformer type welding machine
tig welding
Auto darkening welding helmet is the best welding helmet.