The symbolic representation of a V weld of chamfered plates in a technical drawing

The British Standard for weld symbols is BS EN 22553. When identification of the weld process is required as part of the weld symbol the relevant weld process code is listed in BS EN ISO 4063. Welding symbols. Welding symbols This engineering drawing present weld type symbols and fillet weld symbols. The weld type symbol is typically placed above or below the center of the reference line, depending on which side of the joint it's on. The symbol is interpreted as a simplified cross-section of the weld. Symbols can be made to either the AWS or ISO standard. AWS follows the specification titled 'AWS A2.4:2007 Standard Symbols for Welding, Brazing. AWS follows the specification titled 'AWS A2.4:2007 Standard Symbols for Welding, Brazing. Welding symbols have an Arrow side and an Other side. This standard has now been superseded by BS EN 22553, however in many welding and fabrication organisations there will be old drawings used that make reference to out of date standards such as BS 499 Pt 2. BS EN 22553 is almost identical to the original ISO 2553 standard on which it was based.

The symbols and conventions used in welding documentation are specified in national and international standards such as ISO 2553 Welded, brazed and soldered joints -- Symbolic representation on drawings and ISO 4063 Welding and allied processes -- Nomenclature of processes and reference numbers. The US standard symbols are outlined by the American National Standards Institute and the American Welding Society and are noted as 'ANSI/AWS'.^[1] Due in part to the growth of the oil industry, this symbol set was used during the 1990s in about 50% of the world's welding operations.^[1] An ISO committee sought to establish a global standard during this decade.^[1]

European Standard Welding Symbols

In engineering drawings, each weld is conventionally identified by an arrow which points to the joint to be welded. The arrow is annotated with letters, numbers and symbols which indicate the exact specification of the weld. In complex applications, such as those involving alloys other than mild steel, more information may be called for than can comfortably be indicated using the symbols alone.^[1] Annotations are used in these cases.^[1]

Component elements[edit]

The location of the elements of a welding symbol when following US conventions.

In the US, the component elements of the weld specification are:^[2]

The reference line - the body of the arrow which is the baseline for the specification.
The arrow tip which goes at an angle to the reference line, pointing to the joint to be welded.
The tail which goes at the other end of the reference line.
The basic welding symbol which goes on the reference line to indicate the shape of the weld such as a fillet or plug. The symbol is placed on the arrow side or other side of the line to indicate which side of the joint the weld goes.
The dimensions and other numbers such as the length of the weld or number of spot welds go above and below the reference line.
Supplementary symbols go at the junction of the reference line and the arrow tip. One such symbol is a circle to indicate an all-around weld, which goes on every side of the joint.
Finish symbols go above the reference line to indicate the surface contour or finish of the weld such as flush, convex or concave.
Letters indicating the welding process are placed at the tail end, such as AHW for atomic hydrogen welding. Further examples include:

Abbreviations for welding processes[edit]

If a particular welding process needs to be indicated in addition to the symbols, the following abbreviations are commonly used in North America:^[3]^[2]

Designation	Welding process
CAW	Carbon-arc welding
DB	Dip brazing
FB	Furnace brazing
FW	Flash welding
GMAW	Gas metal-arc welding
GTAW	Gas tungsten-arc welding
IB	Induction brazing
OAW	Oxy-acetylene welding
OHW	Oxy-hydrogen welding
PGW	Pressure gas welding
RB	Resistance brazing
SAW	Submerged arc welding
TB	Torch brazing
UW	Upset welding
SMAW	Shielded Metal Arc Welding

Iso Welding Symbols Chart

References[edit]

Iso Standard Weld Symbols

^ ^a^b^c^d^eE. N. Gregory; Ann A. Armstrong (20 April 2005). Welding symbols on drawings. CRC Press. pp. 7–8. ISBN978-0-8493-3591-4. Retrieved 10 October 2011.
^ ^a^bWelding Theory and Application(PDF) (Training Circular 9-237), Department of the Army, 7 May 1993
^'Welding Inspection Handbook', 3rd edition, American Welding Society, ISBN0-87171-560-0, Miami, FL, pp. 10-11 (2000)

External links[edit]

Welding symbols at Arcraft Plasma Ltd.
Welding symbols and definitions at Metallic Fusion
Standard welding symbols at Engineer's Edge
Extract from Chapter 26 – Welding and welding symbols in Manual of Engineering Drawing by Colin H. Simmons and Dennis E. Maguire. Newnes (2004). ISBN0-7506-5120-2

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International Organization for Standardization - ISO - pipe, tube and fittings standards and specifications

Aws Standards Welding

Industrial pipe, tube and fittings standards and specifications from the ISO - International Organization for Standardization:

ISO 7-1:1994-05
Pipe threads where pressure-tight joints are made on the threads - Part 1: Dimensions, tolerances and designation
ISO 7-2:2000
Pipe threads where pressure-tight joints are made on the threads - Part 2: Verification by means of limit gauges
ISO 49:1994
Malleable cast iron fittings threaded to ISO 7-1
ISO 228-1:2000
Pipe threads where pressure-tight joints are not made on the threads - Part 1: Dimensions, tolerances and designation
ISO 228-2:1987
Pipe threads where pressure-tight joints are not made on the threads; Part 2 : Verification by means of limit gauges
ISO 264:1976
Unplasticized polyvinyl chloride (PVC) fittings with plain sockets for pipes under pressure; Laying lengths; Metric series
ISO 265-1:1988
Pipes and fittings of plastics materials; fittings for domestic and industrial waste pipes; basic dimensions: metric series; part 1: unplasticized poly(vinyl chloride) (PVC-U)
ISO 392:1986
Asbestos-cement pipe fittings for building and sanitary purposes
ISO 580:1990
Injection-molded unplasticized poly(vinyl chloride) (PVC-

Iso Standards Welding Symbols