The welds would be in the horizontal position. Did I answer your question? Or if it is a square edge joint shown in bottom picture , then after the first side is welded, the second side of joint must first be back gouged to sound weld metal. Process selection is determined by the method of assembly, the welding position and whether mechanisation is a viable proposition to improve productivity and to provide consistent weld quality. This reduces both the amount of filler metal required to fill the joint and the welding time. In addition, proper joint dimensions are necessary to ensure that the root pass has the correct depth to width ratio discussed later in this article. As a design engineer you should be aware of the factors affecting weld quality, however it is not the responsibility of the designer to check the quality of the welds.
Lecture 11.2.2: Welded Connections -
By Regis Geisler November 26, Studs are loaded into the gun and on making electrical contact with the work, the tipped end arcs and melts. These methods determine a level of preheating to modify cooling rates, which allows time for the hydrogen to migrate to the surface and escape particularly if maintained as a post heat on completion of the joint instead of becoming trapped in the hard, stressed zones. Welds with effective lengths shorter than 40mm or 6 times the throat thickness, whichever is larger, should be ignored for transmission of forces. The B-U3c-S joint design shown in Figure 1 for submerged arc welds shows a 70 deg included angle, which is determined from the addition of the 35 deg bevel angle on both plates.
A Full Penetration Weld Symbol Does not list a dimension
To reduce the stress concentration, a gradual transition from one section to the other is recommended Figure 5. Modern Furnace Brazing School. Before a welded joint can be made on a project, it must be proven that the weld can be made using the desired materials and attain the required strength and ductility. See examples in Figure 1. Students Click Here Join Us! I also want to study if there is any strength difference in weld joints when different configurations are used.
This benefit could be potentially realized by using the Submerged Arc Welding SAW process, known for its deep penetration capabilities. Once a welder demonstrates that they can consistently create a weld that meets performance specifications then they are certified to make that particular weld. According to Eurocode 3 , the throat thickness must be taken as the depth of the butt preparation minus 2mm, where the preparation is the depth of the bevel, see Figure 2. If you have shallow penetration, the weld is weaker. However, if significant and consistent root penetration can be achieved, which significantly increases the effective throat depth, then the fillet leg size can be reduced without sacrificing weld strength see example in Figure 7. This page was last edited on 21 April , at