By Blodgett O.
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Extra resources for Design of Weldments, Part A
Eliminate or reduce preheat by using lowhydrogen electrodes. 6. e are Iarge enough to do the job. Use an electrode holder that allows the use of high welding current, 8. Use manual electrodes down to a 2rr stub. 9. Weld in flat downhand position if possible' Overhead and vertical welds are more expensive. 10. U possible, position fillet welds in the flat (trough) position for highest welding speed. 11. weld sheet metal 45o downbill. 12. Consider welding from one side only (if plates are not too thick) instead of both ,sides, to eliminate necessity for turning over heavjr weldment or using overhead welding.
5teel we ldmen fs desig ned occordingly. meet the requirements. rl morethorouilhlv with thc vlrri,)uj Lvpes of lo:rd. somo of the mrin Ieafures of elch rre ilcsCrtbed hpre_ 1. Tension is the force thtrt pulls a member from two oppos ing di rect ions. lts iIdeform]_ lion by elong:trion. Excessivetensile loedingceuses tarlure of rhe member by pullrng il aparr. \,, and the tensioo member of the lever system "D". As a tensile load is increased, the member elongates and its cross-sectional area d""aur""".
Rection nerpendicular as well as parallel to the axis of - . it. The metal is stressed in tensiolin a direc_ 3. VATUE OF IOAD ln order to use many designformutas, it is nec_ essary to determine the amount of Ioad that will be applied to each machine member. The methods of I STATIC As in deod weight T---------f ]MPACT VARIABLE As in dropped weight As rn com-cction Fis. 2 A Iood moy be siotic, impoct, or voriqble occordiing to ihe woy In which the lood is opplied to the mqchine member. tion 45o to these shear stresses and in compression at 90o to the tensile stresses.