Welding Symbols & their description

WELDING SYMBOLS

• ·        Butt Joint: 

Being the universally accepted method for attaching a pipe to itself it’s also used for valves, flanges, fittings, and other equipment.   A butt welding joint is also known as a square grove weld.  It’s the easiest and probably the most common weld there is.  It consists of two flat pieces that are side by side parallel.  It’s a very affordable option.

• ·        BEAD:

A type of weld created by one or more string or weave beads deposited on an unbroken plane

• ·        FILLET:

Type of weld, approximately triangular cross section joining two surfaces at approximately exact angles to each other.

• ·        PLUG:

A circular fusion weld through in the hole of a slotted lap or tee joint.

• ·        SQUARE:

A type of groove weld with a small separation at the edges of the base metal parts.

• ·        V-GROOVE:

A groove weld in which the joint edge of each member is beveled from the similar side.

• ·        U-GROOVE:

A groove weld in which the joint edge of both members is equipped in the form of a J from one side, giving a final U form to the fulfilled weld.

• ·        J-GROOVE:

A type of groove weld in which one member has a joint edge in the form of a J from one part.

•         FLARE V:

A type of groove weld, generally used to join two round or curved parts.

• ·        FLARE BEVEL:

A type of groove weld, generally used to join a round or curved piece to a level piece.

• ·        SEAM:

A type of welding, continuous weld made between or upon overlapping metal parts.

• ·        BACK:

A type of weld deposited at the back of a single groove weld.

• ·        SURFACING:

A type of weld which consists of one or more stringer beads or weave beads deposited on an steady surface in order to create desired dimensions or properties.

• ·        EDGE:

A weld that is improperly positioned compared to current work piece design. Edge welds are those welds that stroke or extend beyond the edge of the work piece.

• ·        CORNER:

A type of joint between two metal parts located at exact angles to one another. It requires large amounts of weld metal.

• ·        FIELD WELD:

Fillet Welded Joints are just another terminology for corner, lap, and tee joints. Fillet Welded Joints are the most common type of welding joint and accounts for nearly 75% of joints made with arc welding. You do not need to prepare the edge and this type of joint make it easy to weld piping systems. Butt welds are more expensive than fillet welds. Fillet welds are mostly used in piping systems to join pipe to socket joints.

• ·        CONCAVE:

A type of fillet weld having a concave surface.

• ·        CONVEX:

A type of fillet weld having a convex surface.

• ·        WELD ALL AROUND:

A type of weld in which a specimen being weld from all its specific sides. 

• ·        MELT-THROUGH:

A type of weld, melt-through is the penetrated weld metal that extends beyond the base metal on the backside of a joint welded from the opposite side.

• ·       LAP WELD:   

Lap welding joints are used most often to joint two pieces with differing thicknesses together.  Also considered a fillet type, the weld can be made on one or both sides.  A Lap Joint is formed when 2 pieces are placed in an over lapping pattern on top of each other.