Standard Welding Terms and Definitions

Welding Terminology image

Backing - It is the material placed on the root side of a weld for supporting of molten metal until it solidifies and facilitates complete penetration.
Base metal - The metal to be joined.
Bead (weld bead) - It is a deposit of weld metal during single pass welding.
Cap - It is the last bead of weld joint.
Crater - The depression on weld at the point where the arc strikes the base metal.
Deposition rate - The rate at which welds metal is deposited on the base metal. It is expressed in kg/h.
Fillet weld - The weld of two mutually perpendicular material.
Flux - Material that used to avoid weld defect.
Penetration - The maximum depth at which molten metal penetrates on base metal and then combines them. It is measured from the top surface of the joint.
Butt weld Filled weld image

Paddle - The hole in the weld joint created by the heat of welding. It is used when the sheet metal needed to weld together.
Root - The nearest points between the metal to be joined.
Tack weld - A small temporary welding to hold workpiece together during the actual welding.
Toe of weld - The junction between weld metal and base metal.
Torch - A device to deliver flames during the welding.
Weld face - The exposed surface of the weld joint.
Weld metal - Metal that solidifies to join metal, it may be base metal or base metal along with filler metal.
Weld Pass - The single movement of the electrode or torch that results weld bead.
Weld bevel - Angle cut at the edge of base metal to assist penetration of molten metal.

Read: Advantages and disadvantages of welding joints

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