Tag Archive for Tag: Weld

Tag: Weld Fasteners

Two basic types of fasteners are typically used in construction, bolts and welds. Both are used in the fabricating shop and on the job site in connections joining individual members. Welds are also used to fasten together components of built-up members. Bolts, however, are more commonly used for field connections, and welds, for shop work. Rivets, which were once widely used for main

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Tag: Weld Welding Ferrous Materials

General welding characteristics of the various types of ferrous metals are as follows: Wrought iron is ideally forged but may be welded by other methods if the base metal is thoroughly fused. Slag melts first and may confuse unwary operators. Low-carbon iron and steels (0.30%C or less) are readily welded and require no preheating or subsequent annealing unless residual stresses are to

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Tag: Weld Welded Connections

Various types of welds may be used to joint cold-formed steel members such as groove welds in butt joints, fillet welds, flare groove welds, arc spot welds, arc seam welds, and  resistance welds. The nominal strength, Pn, for several of these weld types is given in this article. More complete information may be found in the AISI Specification. The provisions given are applicable

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Tag: Weld Connections for Simple Beams

End connections of beams to their supports are classified as simple-beam, fully restrained, and partially restrained connections. Simple, or conventional, connections are assumed free to rotate under loads. They are designed to carry shear only. The AISC specifications for structural steel buildings require that connections of this type have adequate inelastic rotation capacity to avoid overstressing the fasteners or welds.

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Tag: Weld Bracket Connections

Brackets are projections that carry loads. The connection of a bracket to a support has to transmit both shear and moment. Fasteners or welds may be used for the purpose. Connections may be made with fasteners or welds subjected only to shear or to combined shear and tension. Figure 5.46 shows a plate bracket connected with bolts in single shear.

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Tag: Weld Column Base Plates

AISC ASD Approach. The lowest columns of a structure usually are supported on a concrete foundation. To prevent crushing of the concrete, base plates are inserted between the steel and concrete to distribute the load. For very heavy loads, a grillage, often encased in concrete, may be required. It consists of one or more layers of steel beams with pipe separators  between them

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Tag: Weld Welding Clearance and Space

Designers and detailers should detail connections to ensure that welders have ample space for positioning and manipulating electrodes and for observing the operation with a protective hood in place. Electrodes may be up to 18 in long and 3⁄8 in in diameter. In addition, adequate space must be provided for deposition of the required size of fillet weld. For example,

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Tag: Weld Weld Quality

A basic requirement of all welds is thorough fusion of weld and base metal and of successive layers of weld metal. In addition, welds should not be handicapped by craters, undercutting, overlap, porosity, or cracks. (AWS D1.1 and D1.5 give acceptable tolerances for these defects.) If craters, excessive concavity, or undersized welds occur in the effective length of a weld,

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Tag: Weld Welding Procedures

Welds should be qualified and should be made only by welders, welding operators, and tackers qualified as required in AWS D1.1 for buildings and AWS D1.5 for bridges. Welding should not be permitted under any of the following conditions: When the ambient temperature is below 0F When surfaces are wet or exposed to rain, snow, or high wind. When welders

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Tag: Weld Limitations on Plug and Slot Weld Dimensions

In material 5⁄8 in or less thick, the thickness of plug or slot welds should be the same as the material thickness. In material more than 5⁄8 in thick, the weld thickness should be at least half the material thickness but not less than 5⁄8 in. Diameter of hole for a plug weld should be at least the depth of

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