By J. Hicks (Auth.)
A realistic 'how to do it' publication written with the layout and welding interface in brain. It informs designers not just of what they need to learn about welding but additionally, and most significantly, units out the data the fashion designer should still provide to the welding engineer or fabrication superintendent in order that the designer's goals should be completed, when it comes to engineering functionality, security, reliability, rate and visual appeal
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Extra resources for A Guide to Designing Welds
Nonetheless, designers should appreciate that the more accessible a welded joint, the more likely it is to be of good quality, and, of equal importance, accessible for inspection and, if necessary, repair. The last point is of some importance for if a defective weld is found on inspection it will have to be taken out and remade, a procedure which may not lend itself to robotics. Naturally, there are methods of reaching points of limited access which are used when the situation demands it but the cost can be astronomical especially if the product is already in service.
The use of radiographs requires that there be access to both sides of the joint, the film being placed on one side and the radiation source on the other. Use of the method therefore has to be taken into account at the design stage. Ultrasonics — a beam of high frequency sound is transmitted into the material from a probe which is also able to detect any reflections of the beam from the opposite surface or from internal discontinuities such as weld defects. Progress of the beam is displayed on a cathode ray tube giving trained and experienced operators information from which, with a knowledge of the original weld preparation, they can indicate the position of the defect and its size.
Specifications will be found in many series of standards for steel forgings and castings as well as cold formed sheet, concrete reinforcing bar and other product forms. For specific uses the designer should refer to the standards catalogue relevant to the project. Outside the range of steels made to these standard specifications are those offered by most of the world's steel companies. Some of these are made to meet other national standard specifications and some are proprietary steels made by one particular company.