TABLE OF CONTENTS
ABSTRACT
Joining two or more elements to a single part is called fabrication process. Welding comes under this one of the fabrication process. In this article we discussed about different welding terminologies or terms and their sort definition. From the past days, fabrication is used in aircraft ship building, bridge construction to even sheet metal joining. Brazing, soldering, riveting, welding, Screw and bolt joint all comes under fabrication process. joining by Bolts and screws is temporary, riveting is also semi permanent, but welding is one of the permanent joint due to this it’s used nowadays almost every places for joining purposes.
Before understanding different welding terms, let’s know what is fillet and butt weld.
DEFINITION OF FILLET WELD
A triangular section deposited between two surfaces of parent metal usually at right angles if the weld face is concave then it is called concave fillet weld and if convex then it’s known as a convex fillet weld. When the face is flat or nearly flat, then it’s called ” Mitre fillet weld” or “Flat face fillet weld” is employed.
DEFINITION OF BUTT WELD
Weld sections deposited between two faces of parent metal usually at 180°. The weld sections typically depend upon various edge preparations of the both parent metals and concerned butt weld is termed as related edge preparation.
ALSO READ:- WELDING ELECTRODE SIZES AND TYPES OF FLUX AND IT’S PURPOSE
DIFFERENT WELDING TERMINOLOGIES
1. PARENT METAL
The material or the part to be welded but not the filler metal.
2. ROOT
The position in a joint where two parent metal comes nearest together.
3. ROOT FACE
A surface formed on the parent metal to take the root of a weld used in conjunction with a grooved or beveled preparation for butt Welding.
4. ROOT GAP
The gap in the root by which edges of a joint are separated prior to welding.
5. RUN
The metal deposited during one pass or a single layer of deposited metal also called pass or bead.
6. ROOT RUN
The first run deposited in the root of a joint.
7. MULTIRUN
More than one run in a joint.
8. SEALING RUN
A small weld or run deposited on the root side of the butt or corner joint after finishing the weld joint.
9. BACKING RUN
A small weld deposited on the root side of the butt or corner joint before starting weld joint.
10. FUSION ZONE OR WELD ZONE
The area or portion to which parent metal has been fused.
11. FUSION FACE
The Portion of a surface which is to be fused on making the weld.
12. PENETRATION
The depth of fusion zone in the parent metal.
13. WELD FACE
The surface of a weld seen from the side from which weld was made.
14. HEAT AFFECTED ZONE(HAZ)
Metallurgical properties have been changed by the welding heat adjacent to weld.
15 WELD JUNCTION
The boundary between the fusion zone and heat affected zone.
16. TOE OF WELD
The point where the weld face joins the parent metal.
17. REINFORCEMENT
The excess metal over the line joining two toes or metal deposited on the surface of parent metal.
18 THROAT THICKNESS
The distance between the junction of the metal and point where the weld metal touches the base metal toe.
19. LEG LENGTH
The distance between the junction of the metal and the point where weld metal touches the base metal toe.
20. WELD SEQUENCE
The order in which the welds or runs are made. This includes also the direction in which the runs are laid down.
