Within the course, we cover all the mistakes that we’ve discussed in this blog series in addition to the rules that apply to all other welding symbols. Until then, get better acquainted with the rules governing these symbols by checking out our course, Understanding Welding Symbols. We’ll be back soon with five more of these tidbits. Below we’ve included a list to make it easy for you to determine when an arrow should be pointing at the joint or surface. The distinction depends on the type of weld. You may notice that sometimes the arrow points at a joint and other times it points directly at the surface. Proper arrow placement on a print is very crucial. In order to indicate that a flat contour is desired, a tail is added to the symbol and the finishing method is written within it, i.e. Again, we find one symbol being used for two separate intentions. The supplementary weld symbol used to represent both of these contours is a straight line. Flush, however, requires that the weld be laid or finished in such a way that it rests flush against the part or base material itself. The difference between the two contours is this: flat simply means that the face of the weld must be, well, flat. The four contours include convex, concave, flat, and flush. Weld faces can be finished using a number of different contours and finishing methods. An object line takes precedence over a hidden line and a hidden line takes precedence over a centerline. When all of these are present, they follow a hierarchy. They are used to indicate the very center of a symmetrical part or joint. Centerlines, however, are comprised of long line segments followed by short line segments. Hidden lines are dashed and represent the edges not visible to the eye. Object lines are solid and represent the edges of a part or joint. The three basic lines you’ll find on a print are object lines, hidden lines, and center lines. With so many lines competing for pride of place on a plan, it’s hard to tell what each of them mean and which takes precedence. When looking at a print, you may notice solid lines, dashed lines, and segmented lines of varying lengths. No need to bring a tail into the situation. This is because backing is always applied to the joint first. Since it’s closest to the tip of the arrow, we know immediately that the symbol calls for a backing weld. The symbol pictured here depicts a backing weld symbol on the first line. You see, when more than one reference line is attached to an arrow, the weld on the reference line closest to the tip of the arrow is applied to the joint first. Two reference lines can also be used to indicate the very same thing. Since a semi-circle is used to communicate both back and backing welds, a tail is added to the welding symbol and the phrase “back weld” or “backing weld” is written within it. Let’s take a look at how to differentiate between the two. Simple enough, right?īack and backing welds also share a weld symbol, a semi-circle to be more precise. As a reference, take a look at the double bevel groove weld with a spacer pictured below. If a spacer is required, a rectangle is centered on the reference line and the groove weld symbol is split in two and placed on either end of the spacer symbol. When a joint requires backing, the backing supplementary weld symbol is placed opposite the groove weld symbol on the reference line. Backing is paired with a groove weld symbol. In Welding Symbols Demystified: Part 2, we discussed how to differentiate between a plug weld and slot weld symbol. So what’s the key to telling one apart from the other? The answer is placement. The weld symbol for a spacer is a tried and true rectangle. And a spacer? I’ll give you three guesses, but you may only need one. What about backing? Well, backing happens to be represented by a rectangle as well. As we discussed, the weld symbol for a plug weld is a rectangle. A spot weld symbol is similar to a seam weld symbol, and so on. There are many similar symbols on a print. I’m here to tell you that there are a few more look-alikes plaguing your prints, and plug and slot welds find themselves in the thick of it yet again. In our blog entitled Welding Symbols Demystified: Part 2, we discussed plug welds, slot welds, and their shared weld symbol. Due to continued interest in these previously published blogs, we’ve decided to come back with a whole new set of common misinterpretations of AWS A2.4 Standard Symbols for Welding, Brazing, and Nondestructive Examination. We’ve published several blogs over the years, and while we receive comments on all of them, we’ve noticed a steady stream of feedback on our blogs about welding symbols. Control Visual de la Calidad de Soldaduras.How to Increase Your Facility’s Productivity.Aluminum Welding for Fabricators, Inspectors & Engineers.Certified Resistance Welding Technician.
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