BASIC WELDING SYMBOLS 05-AUG-2006

WHAT IS A WELDING SYMBOL? WHAT IS WELDING? A metal-joining process that uses the heat generated by a combination of oxygen and a fuel gas to melt two similar metals together and are integrally joined when cooled. WHAT IS A WELDING SYMBOL? Graphical symbols for welding to convey the complete welding information from the designer to the welder in terms of drawings. It denotes a symbol made up of several elements to convey the welding instruction WELD SYMBOLS: It is an ideograph ,used to indicate the type of weld required 05-AUG-2006

EIGHT ELEMENTS OF WELDING SYMBOLS REFERENCE LINE ARROW BASIC WELD SYMBOLS DIMENSIONS AND OTHER DATA SUPPLEMENTARY SYMBOLS COUNTER AND FINISH SYMBOLS TAIL SPECIFICATIONS PROCESS OR OTHER REFERENCE 05-AUG-2006

Basics of the welding symbol Reference line Basics of the welding symbol Other elements are oriented with respect to this line Arrow Arrow side Other side-opposite side Basic weld symbol Indicates the type of welding to be performed Placed on center of the reference line, either below or above or on both sides. 05-AUG-2006

Supplementary Symbols: Placed at the end of the reference line at the base of the arrow Conveys additional information relative to the extent of welding, where the welding is to be performed. Dimensions: Length-Right Size-Left Spacing of the weld or weld symbols If length is followed by Dash and another number –indicates center to center spacing of intermittent welds. The number of spot or projection weld is enclosed in parentheses. 05-AUG-2006

Counter and finish symbols: The counter symbol is placed above or below the weld symbol Finish symbol always appears above or below the counter symbol Finish Symbols: C-Chipping G-Grinding H-Hammering M-Machining 05-AUG-2006

It is used to locate specification, process of other reference Tail Specification: It will appear on the end of the reference line opposite to the arrow end. It is used to locate specification, process of other reference If no tail-When no spec. Specification and process: Placed in the tail of the welding symbol If the spec is given in notes, or indicated elsewhere on the drawing, it should not be used. 05-AUG-2006

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REFERENCE LINE AND ARROW 05-AUG-2006

BASIC WELD SYMBOLS SQUARE WELD FILLET WELD BEVEL V-GROOVE 05-AUG-2006

Continued…. FLARE BEVEL FLARE-V 05-AUG-2006

DIMENSIONS AND OTHER DATA FILLET SIZE FILLET LENGTH IF THE FILLET LENGTH IS FOLLOWED BY A DASH AND A NUMBER ,i.e. CENTER-TO-CENTER DISTANCE OF INTERMITTENT WELDS. GROOVE ANGLE 05-AUG-2006

SUPPLEMENTARY SYMBOLS WELD ALL AROUND FIELD WELD 05-AUG-2006

COUNTER AND FINISH SYMBOLS FLUSH CONVEX CONCAVE 05-AUG-2006

TAIL SPECIFICATIONS 05-AUG-2006

PROCESS OR OTHER REFERENCE EBW STANDS FOR - ELECTRONIC BEAM WELDING 05-AUG-2006

BOTH SIDES SAME FILLET SIZE FILLET WELD ARROW SIDE BOTH SIDES SAME FILLET SIZE 05-AUG-2006

BOTH SIDES WITH DIFF.FIILET SIZES FIILET SIZE WITH LENGTH-INTERMITTENT WELD 05-AUG-2006

FILLET WELD ALL AROUND 05-AUG-2006