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[[File:Symboles soudure V.svg|thumb|right|The symbolic representation of a V weld of chamfered plates in a technical drawing]]
[[File:Symboles soudure V.svg|thumb|right|The symbolic representation of a V weld of chamfered plates in a technical drawing]]
The '''symbols and conventions used in [[welding]] documentation''' are specified in national and international standards such as [[International Organization for Standardization|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".<ref name=greg>{{cite book|author1=E. N. Gregory|author2=Ann A. Armstrong|title=Welding symbols on drawings|url=http://books.google.com/books?id=X9cxdD6GfdIC&pg=PR7|accessdate=10 October 2011|date=20 April 2005|publisher=CRC Press|isbn=978-0-8493-3591-4|pages=7–8}}</ref> 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.<ref name=greg/> An ISO committee sought to establish a global standard during this decade.<ref name=greg/>
The '''symbols and conventions used in [[welding]] documentation''' are specified in national and international standards such as [[International Organization for Standardization|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".<ref name=greg>{{cite book|author1=E. N. Gregory|author2=Ann A. Armstrong|title=Welding symbols on drawings|url=http://books.google.com/books?id=X9cxdD6GfdIC&pg=PR7|accessdate=10 October 2011|date=20 April 2005|publisher=CRC Press|isbn=978-0-8493-3591-4|pages=7–8}}</ref> 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.<ref name=greg/> An ISO committee sought to establish a global standard during this decade.<ref name=greg/>


In [[engineering drawing]]s, 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 [[alloy]]s other than [[Carbon steel|mild steel]], more information may be called for than can comfortably be indicated using the symbols alone.<ref name=greg/> Annotations are used in these cases.<ref name=greg/>
In [[engineering drawing]]s, 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 [[alloy]]s other than [[Carbon steel|mild steel]], more information may be called for than can comfortably be indicated using the symbols alone.<ref name=greg/> Annotations are used in these cases.<ref name=greg/>
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# The reference line - the body of the arrow which is the baseline for the specification.
# 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 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 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 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.
# 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.
# 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.
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# Letters indicating the welding process are placed at the tail end, such as AHW for [[atomic hydrogen welding]]. Further examples include:
# 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==
==Abbreviations for welding processes==
If a particular welding process needs to be indicated in addition to the symbols, the following abbreviations are used.
If a particular welding process needs to be indicated in addition to the symbols, the following abbreviations are used.


{| class="wikitable sortable" style="text-align:center; width:50%;"
{| class="wikitable sortable" style="text-align:center; width:50%;"
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! Designation!! Welding process
! Designation!! Welding process
|-
|-
| CAW || [[Carbon-arc welding]]<ref name=TC9237/>
| CAW || [[Carbon-arc welding]]<ref name=TC9237/>
|-
|-
| DB || [[Dip brazing]]<ref name=TC9237/>
| DB || [[Dip brazing]]<ref name=TC9237/>
|-
|-
| FB || [[Furnace brazing]]<ref name=TC9237/>
| FB || [[Furnace brazing]]<ref name=TC9237/>
|-
|-
| FW || [[Flash welding]]<ref name=TC9237/>
| FW || [[Flash welding]]<ref name=TC9237/>
|-
|-
| GMAW || [[Gas metal arc welding|Gas metal-arc welding]]<ref name=TC9237/>
| GMAW || [[Gas metal arc welding|Gas metal-arc welding]]<ref name=TC9237/>
|-
|-
| GTAW || [[Gas tungsten-arc welding]]<ref name=TC9237/>
| GTAW || [[Gas tungsten-arc welding]]<ref name=TC9237/>
|-
|-
| IB || [[Induction brazing]]<ref name=TC9237/>
| IB || [[Induction brazing]]<ref name=TC9237/>
|-
|-
| OAW || [[Oxy-acetylene welding]]<ref name=TC9237/>
| OAW || [[Oxy-acetylene welding]]<ref name=TC9237/>
|-
|-
| OHW || [[Oxyhydrogen welding|Oxy-hydrogen welding]]<ref name=TC9237/>
| OHW || [[Oxyhydrogen welding|Oxy-hydrogen welding]]<ref name=TC9237/>
|-
|-
| PGW || [[Pressure gas welding]]<ref name=TC9237/>
| PGW || [[Pressure gas welding]]<ref name=TC9237/>
|-
|-
| RB || [[Brazing#Heating methods|Resistance brazing]]<ref name=TC9237/>
| RB || [[Brazing#Heating methods|Resistance brazing]]<ref name=TC9237/>
|-
|-
| SAW || [[Submerged arc welding]]<ref name=TC9237/>
| SAW || [[Submerged arc welding]]<ref name=TC9237/>
|-
|-
| TB || [[Brazing#Heating methods|Torch brazing]]<ref name=TC9237/>
| TB || [[Brazing#Heating methods|Torch brazing]]<ref name=TC9237/>
|-
|-
| UW || [[Upset welding]]<ref name=TC9237/>
| UW || [[Upset welding]]<ref name=TC9237/>
|}
|}


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| title = Machine Drawing
| title = Machine Drawing
| publisher = New age International
| publisher = New age International
| isbn =978-81-224-1917-7
| isbn =978-81-224-1917-7
}}
}}
* {{Cite book
* {{Cite book
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| year = 2003
| year = 2003
| title = Machine Drawing
| title = Machine Drawing
| publisher = Charotar Publishing House
| publisher = Charotar Publishing House
| isbn = 81-85594-19-8
| isbn = 81-85594-19-8
}}
}}
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*[http://www.unified-eng.com/scitech/weld/weld.html Deciphering welding symbols] at Unified Engineering Inc.
*[http://www.unified-eng.com/scitech/weld/weld.html Deciphering welding symbols] at Unified Engineering Inc.
*[http://www.arcraftplasma.com/weldingsymbols.htm Welding symbols] at Arcraft Plasma Ltd.
*[http://www.arcraftplasma.com/weldingsymbols.htm Welding symbols] at Arcraft Plasma Ltd.
*[http://www.metallicfusion.com/symbols_and_definitions.htm Welding symbols and definitions] at Metallic Fusion
*[http://www.metallicfusion.com/symbols_and_definitions.htm Welding symbols and definitions] at Metallic Fusion
*[http://www.engineersedge.com/weld_symbol.htm Standard welding symbols] at Engineer's Edge
*[http://www.engineersedge.com/weld_symbol.htm Standard welding symbols] at Engineer's Edge
*[http://www.download-it.org/free_files/filePages%20from%2026.%20Welding%20and%20welding%20symbols.pdf Extract from Chapter 26 – Welding and welding symbols] in ''Manual of Engineering Drawing'' by Colin H. Simmons and Dennis E. Maguire. Newnes (2004). ISBN 0750651202
*[http://www.download-it.org/free_files/filePages%20from%2026.%20Welding%20and%20welding%20symbols.pdf Extract from Chapter 26 – Welding and welding symbols] in ''Manual of Engineering Drawing'' by Colin H. Simmons and Dennis E. Maguire. Newnes (2004). ISBN 0-7506-5120-2




Revision as of 05:55, 19 March 2012

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

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]

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

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]

  1. The reference line - the body of the arrow which is the baseline for the specification.
  2. The arrow tip which goes at an angle to the reference line, pointing to the joint to be welded.
  3. The tail which goes at the other end of the reference line.
  4. 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.
  5. The dimensions and other numbers such as the length of the weld or number of spot welds go above and below the reference line.
  6. 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.
  7. Finish symbols go above the reference line to indicate the surface contour or finish of the weld such as flush, convex or concave.
  8. 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

If a particular welding process needs to be indicated in addition to the symbols, the following abbreviations are used.

Designation Welding process
CAW Carbon-arc welding[2]
DB Dip brazing[2]
FB Furnace brazing[2]
FW Flash welding[2]
GMAW Gas metal-arc welding[2]
GTAW Gas tungsten-arc welding[2]
IB Induction brazing[2]
OAW Oxy-acetylene welding[2]
OHW Oxy-hydrogen welding[2]
PGW Pressure gas welding[2]
RB Resistance brazing[2]
SAW Submerged arc welding[2]
TB Torch brazing[2]
UW Upset welding[2]

References

  1. ^ a b c d e E. N. Gregory; Ann A. Armstrong (20 April 2005). Welding symbols on drawings. CRC Press. pp. 7–8. ISBN 978-0-8493-3591-4. Retrieved 10 October 2011.
  2. ^ a b c d e f g h i j k l m n o Welding Theory and Application (PDF), Department of the Army, 7 May 1993

Further reading

  • K.L.Narayana,P.Kannaiah,K.Venkata Reddy (2008). Machine Drawing. New age International. ISBN 978-81-224-1917-7.{{cite book}}: CS1 maint: multiple names: authors list (link)
  • N.D.Bhatt,V.M.Panchal (2003). Machine Drawing. Charotar Publishing House. ISBN 81-85594-19-8.

External links

Retrieved from "https://en.wikipedia.org/w/index.php?title=Symbols_and_conventions_used_in_welding_documentation&oldid=482675110"