For a rectangular weld-bead track resisting bending, develop the necessary equations to treat cases of vertical welds, horizontal welds, and weld-all-around patterns with depth d and width b and allowing central gaps in parallel beads of length b1 and d1 . Do this by superposition of parallel tracks, vertical tracks subtracting out the gaps. Then put the two together for a rectangular weld bead with central gaps of length b1 and d1 . Show that the results are br>

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A = 1.4 1 4(b-bl + d-di )h I = 0.70711 form =- hl