WELDING REPRESENTATION

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CHAPTER 25

• WELDING REPRESENTATION

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25.1IMPORTANCE OF THE DRAWING

• Welding is used very extensively and for large
  variety of purposes. It is essential to show
  accurate method of welding on working drawing.
• To provide complete weld information on the
  drawing, a system of welding symbols was
  developed by ANSI.

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25.2 WELDING PROCESSES

• Three welding processes
• Gas welding (Oxyacetylene welding)
• Electric arc welding (Arc welding)
• Electric resistance welding (Resistance welding)

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25.3 TYPS OF WELD JOINTS

• There are five basic types of weld joints.
• But joint
• Corner joint
• T joint
• Over lap joint
• Edge joint

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25.4 TYPES OF WEELD

• Four basic types of arc and Gas weld.
• Back or backing
• Fillet
• Plug or spot
• Groove

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25.5 WELDING SYMBOLS
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Note that for all fillet or groove symbols, the
vertical side of the symbol is always drawn on
the left.
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A COMPLETE WELD SYMBOL
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WELD PROCESS

• If no reference is indicated in the symbol, the
  tail is omitted.

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Welds extending completely around a joint are
indicated by an open circle around the elbow of
the arrow.
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FIELD WELD
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Spot, seam, flash, or upset symbols usually do
not have arrow side or other side significance
and are simply centered on the reference line of
the arrow.
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BEVEL OR J-GROOVE WELD
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FILLET WELD
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Cchipping, Ggrinding, Mmachining,
RrollingHhammering For only letter, no
finishingFor finishing, show finish symbol as
well.
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25.7 GROOVE WELDThe depth of the V, J or U weld
is the size.A general note may also be used as
ALL V-GROOVE WELDS TO HAVE 600ANGLE UNLESS
OTHERWISE SHOWNRoot penetration and angle shown
vertically.
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When groove welds are to be approximately flush
without finishing, the flush contour symbol is
added.
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If the welds are to be machined, the flush
contour symbol and standard finish symbol are
shown.
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25.8 BACK OR BACKING WELD
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25.9 SURFACE WELDShow the deposit of the weld at
left side of the symbol.Since used for build up
the surfaces not for joint, no arrow or other
side, symbol always below.
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25.10 PLUG OR SLOT WELDA hole or slot is made in
one member to receive the weld. Size is the
smallest diameter of the plug hole.Dimension for
the slot weld on drawing as in (f).
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Plug weld is to filled the full depth. If no then
depth is indicated inside symbol.
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25.11 SPOT WELDThe size of the spot weld is its
diameter. May have or may not have arrow side or
other side significance.
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25.12 SEAM WELDING May have or may not have
arrow side or other side significance. The size
of the seam weld is width.