Transcript Document
WELDING DRAWINGS WELD TERMINOLOGY Weld terminology Leg Face Throat Groove radius Root opening (groove weld) is the space between the pieces before welding* Root face Groove angle WELDING DRAWINGS WELD TERMINOLOGY WELDING DRAWINGS WELD TERMINOLOGY WELDING DRAWINGS WELD TERMINOLOGY WELDING DRAWINGS SINGLE DOUBLE FILLET FILLET AND GROOVE WELDS WELDING DRAWINGS SINGLE DOUBLE SQUARE FILLET AND GROOVE WELDS WELDING DRAWINGS SINGLE DOUBLE BEVEL GROOVE FILLET AND GROOVE WELDS WELDING DRAWINGS SINGLE DOUBLE V-GROOVE FILLET AND GROOVE WELDS WELDING DRAWINGS SINGLE DOUBLE J-GROOVE FILLET AND GROOVE WELDS WELDING DRAWINGS SINGLE DOUBLE U-GROOVE FILLET AND GROOVE WELDS WELDING DRAWINGS SINGLE DOUBLE FLAREBEVEL GROOVE FILLET AND GROOVE WELDS WELDING DRAWINGS SINGLE DOUBLE FLARE-V GROOVE FILLET AND GROOVE WELDS Location of weld symbol wrt joint* Welds on the arrow side of the joint are shown by placing the weld symbol below the reference line Welds on the other side of the joint are shown by placing the weld symbol above the reference line Welds 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 construction Small 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-allaround symbol placed at the intersection of the reference line and the arrow Not 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 member Fillets 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 left Specify dimensions of fillet welds on both sides of a joint Vertical part of fillet weld symbol always on left* If using a general note giving fillet weld dimensions, dimensions may be left off WS If dimensions differ from general note show them on WS Length 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 symbol Dimensions of groove weld are shown on the same side of the reference line as the welding symbol When 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 once When 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 welds The back weld is made after the groove weld The backing weld is made before the groove weld WELDING DRAWINGS APPLICATION OF BACK AND BACKING WELD SYMBOLS 18-5 Other basic welds Plug Slot Spot Seam Surface Flanged Stud WELDING DRAWINGS OTHER BASIC WELDING SYMBOLS AND THEIR LOCATION SIGNIFICANCE