New PDF release: Engineering, Costs, Quality, and Safety

By W. H. Kearns (eds.)

ISBN-10: 1349055646

ISBN-13: 9781349055647

ISBN-10: 1349055662

ISBN-13: 9781349055661

ISBN-10: 2162162172

ISBN-13: 9782162162178

ISBN-10: 3183193213

ISBN-13: 9783183193219

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Extra resources for Engineering, Costs, Quality, and Safety

Example text

The minimum fiHet weid size is intended to ensure sufficient heat input to reduce the possibility of cracking in either the heat-affected zone or weid metal, especiaHy in a restrained joint. The minimum size applies if it is greater than the size required to carry design stresses. CYCLIC LOADING When metals are subjected to cyclic tensile or alternating tensile-compressive stress, they may fail by fatigue. The performance of a weid under cyclic stress is an important consideration in structures and machinery.

Joint preparation for electroslag welding consists of square flame-cut edges. Weid joint length is not critical, but the joint must be aligned and properly fixtured to permit continuous welding. In general, it is not practical to weid plate thicknesses less than 3/4 in. with this process. Two variations of the electroslag welding process are generally used, conventional and consumable guide. The specific variation determines joint accessibility requirements. DESIGN OF WELDED JOINTS TYPES OF JOINTS The loads in a welded structure are transferred from one member to another through welds placed in the joints.

Weid metal with a strength level equal to or less than matching weid metal may be used . S: S· ~ '0> ~ oq. 48/ DESIGN FOR WELDING Butt joint Beam 10 column (A) Complete-joint-penetration groove weid in tension Column field spl ice Column field splice Partia I jOint penetration Complete joint penetration (BI Compression normal to axis of weid Filiel welds t Groove welds (Cl Tension or compression parallel to weid axis Fig. 32-Examples 01 welds with various types olloading Design/or We/ding / 49 /weld < Longitudinal web splice Verticle web splice (0) Complete-joint-penetrtion groove weid in shear Shear Tension (E) Partial-joint-penetration groove welds (F) Shear parallel to weid axis (G) Fillet welds loaded in shear Fig.

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Engineering, Costs, Quality, and Safety by W. H. Kearns (eds.)


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