The types of groove welds are clas sified as either

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of the plates is notched to receive the welds is called a single-V groove weld. The types of groove welds are clas- sified as either partial penetration or full penetration groove welds. Partial penetration welds are welds where the required weld strength can be achieved by preparing only a partial depth of the part to be welded. A full pene- tration weld is a weld where the required weld strength can only be achieved by preparing the entire depth of the parts to be joined. Since the weld metal generally has a higher strength than the parts that are being joined, a full penetration weld connection has as much strength as if the adjoined were not connected, but monolithic. Table 12 indicates infor- mation that is provided on a weld symbol as well as the proper locations for that information. Table 12 identifies several types of basic welding symbols that are commonly seen on design documents and shop drawings. A different type of weld that should be addressed is the "seal weld." This is not a technical term, nor is it a rec- ognized weld type, but it is a term that is frequently used when non-structural weld material is desired to fill gaps or prevent water infiltration, such as a cap for an exterior pipe column. First, it must be mentioned that seal welds should be avoided whenever possible. They are very small welds that mate parts that are generally much thicker than the weld itself. The thicker materials have a tendency to absorb the heat form he small seal weld, which cools very quickly. Since the weld cools so quickly it has a tendency to crack and be ineffective. In lieu of a seal weld, there are three suggested alternatives that would apply to the pipe column cap, as well as other conditions. Using the column caps as an example, the first alternative would be to tack weld the cap to the pipe column, and use a high-grade sealant to create the watertight seal at the perimeter of the cap. The advan- tage of this alternate is that it is probably the most cost effective solution. However, the disadvantage is that a sealant will at some point need maintenance. Also, matching the color of a non-paintable sealant to the paint color of the pipe may be difficult to do. Single-bevel-groove weld (partial penetration weld) Single-V-groove weld (partial penetration weld) Single-bevel-groove weld (complete penetration weld) Backing Bar Figure 44. Groove welds Figure 43. Fillet welds Roof Weld Weld Size Face of Weld Toe of Weld Throat
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PAGE 101 SYSTEMS A second alternative is to provide a structural weld to connect the cap to the column. The advantage of this option is that the weld would be continuous, maintenance-free, and watertight. The weld could also be ground smooth to provide a monolithic appearance between the column and the cap. The disadvantage of this solution is that it is a more expensive solution (at least initially) than using a sealant.
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  • Structural steel

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