Welding Drawing

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WELDING DRAWINGS

WELD TERMINOLOGY

Weld terminology

LegFaceThroatGroove radiusRoot opening (groove weld) is the space between the pieces before welding*Root faceGroove angle

WELDING DRAWINGS

WELD TERMINOLOGY

WELDING DRAWINGS

WELD TERMINOLOGY

WELDING DRAWINGS

WELD TERMINOLOGY

WELDING DRAWINGS

FILLET AND GROOVE WELDS

SINGLE DOUBLE

FILLET

WELDING DRAWINGSWELDING DRAWINGS

FILLET AND GROOVE WELDS

SINGLE DOUBLE

SQUARE

WELDING DRAWINGS

FILLET AND GROOVE WELDS

SINGLE DOUBLE

BEVELGROOVE

WELDING DRAWINGS

FILLET AND GROOVE WELDS

SINGLE DOUBLE

V-GROOVE

WELDING DRAWINGS

FILLET AND GROOVE WELDS

SINGLE DOUBLE

J-GROOVE

WELDING DRAWINGS

FILLET AND GROOVE WELDS

SINGLE DOUBLE

U-GROOVE

WELDING DRAWINGS

FILLET AND GROOVE WELDS

SINGLE DOUBLE

FLARE- BEVEL

GROOVE

WELDING DRAWINGS

FILLET AND GROOVE WELDS

SINGLE DOUBLE

FLARE-V GROOVE

Location of weld symbol wrt joint*

Welds on the arrow side of the joint are shown by placing the weld symbol below the reference lineWelds on the other side of the joint are shown by placing the weld symbol above the reference lineWelds on both sides of the joint are shown by placing the weld symbol on both sides of the reference line

WELDING DRAWINGS

WELD TERMINOLOGY

Field welds & All around welds

Field welds*

Not made in the shop or at the place of initial constructionSmall black flag symbol* is placed above and at right angles to the reference line

All around welds

Weld extending completely around a joint is indicated by a weld-all-around symbol placed at the intersection of the reference line and the arrowNot required for welds extending around the circumference of a pipe

Last slide on weld symbols

Multiple reference lines indicate a sequence of operations to be done at a single location*

Tail of welding symbol* Welding process Omitted when no

references are required

WELDING DRAWINGS

COMBINED WELDING SYMBOLS

Design of welded joints

The size of the weld should always be designed with reference to the size of the thinner memberFillets welds are cheaper and easier to apply than groove

Full-strength fillet welds joining 2 different thicknesses of material should be sized using a table of recommended full strength weld sizes based on the thinner plate*

WELDING DRAWINGS

FINISHING OF WELDS

18-3 Fillet Welds & weld symbol (WS)

Dimensions of fillet welds are shown on the same side of the reference line as the WS & to the leftSpecify dimensions of fillet welds on both sides of a jointVertical part of fillet weld symbol always on left*

If using a general note giving fillet weld dimensions, dimensions may be left off WSIf dimensions differ from general note show them on WSLength of weld shown to right of WS

More on fillet welds…

Staggered intermittent fillet welds are designated in the weld symbol by staggering where the weld symbol appears on the reference line (p.724*)

Size of fillet welds

A practical method to size fillet welds is to design the weld for the thinner plate, making it sufficient to carry 1/3 to ½ the carrying capacity of the plate.

WELDING DRAWINGS

COMPARISON OF A CAST SHAFT SUPPORT WITH A WELDED STEEL SHAFT SUPPORT

18-4 Groove Weld symbolDimensions of groove weld are shown on the same side of the reference line as the welding symbolWhen both sides of a double-groove weld have the same (or different) dimension, both sides are dimensioned, however the root opening needs to appear only onceWhen a general note governs dimensions of groove welds, groove welds need not be dimensioned on the weld symbol

Back and Backing welds

Back or backing weld symbols are used to indicate bead-type back or backing welds of singe-groove weldsThe back weld is made after the groove weldThe backing weld is made before the groove weld

WELDING DRAWINGS

APPLICATION OF BACK AND BACKING WELD SYMBOLS

18-5 Other basic welds

PlugSlotSpotSeamSurfaceFlangedStud

WELDING DRAWINGS

OTHER BASIC WELDING SYMBOLS AND THEIR LOCATION SIGNIFICANCE