What do Welding Shade Numbers Mean? What Shade is Safe?
Nov 09, · The A-Number is a calculated value based on a combination of the chemical composition of the weld filler metal (which may be found in ASME Section II Part C), and ASME Section IX’s A-Number Table QW (Applicable only to ferrous metals: A change in the chemical composition of the weld deposit from one A?Number to any other A?Number in Table QW- The A-Number is an essential variable for welding procedure specifications for multiple welding processes. It identifies related filler metals based on their chemical composition and allows procedure qualifications for the whole host of related materials.
Each welding symbol contains the following elements:. A reference line — This is a horizontal line which forms the foundation for all welding symbols. Everything else that you need to know extends from this line. An arrow at the end of the leader line — In essence, the leader line is the shaft of the arrow, while the arrow refers to the actual point itself. This arrow points to the location that needs to be welded.
More details are given by the weld symbols, which will be discussed in more detail later. A weld symbol — This is a series of short lines or a small geometric shape which can be found around the middle of the reference line, placed either directly above or below it. The location of the weld symbol will tell you exactly where to place your weld. If it is sitting below the reference line, then the weld should be placed in the exact position that the arrow is pointing to i.
If the weld symbol is sitting what is a cervidil induction top of the reference line, the weld should be placed on the opposite side of the joint to the arrow. If — on the other hand — the symbol is located on both the top and the bottom of the reference line, then you should weld on both sides of the joint.
It is possible to have different symbols on the top and the bottom of the reference line, in which case two different types of welds should be performed on either side of the joint. Resistance spot, resistance seam, flash and upset weld symbols bear no significance with regards to on which side of the reference line they are placed, or on which side of the joint they should fall. You will probably find several numbers included on your welding symbol.
These should give you an indication of the size that your weld should be. Unless otherwise stated, the unit of measurement is usually the inch.
A number located to the left of your weld symbol tells you the width of the weld, while a number on the right of the weld symbol indicates the length of the weld. If no length is given, then you should assume that it should continue for the entire length of the joint. Sometimes these numbers may be contained within parentheses, in which case they indicate uneven fillet weld lengths.
Just as with the weld symbols, numbers below the reference line apply to welds on the same side of the joint as the arrow; numbers above the reference line apply to welds on the opposite side of the joint. With regards to intermittent fillet welds, the pitch will be placed to the right of the weld symbol. For chain intermittent fillet welding, the dimensions will appear on both sides of the reference line: this is true for welds which line up, and those which are staggered.
Numbers placed to the right of arc spot and arc seam weld symbols indicate the distance that you should leave between the centers of each weld. Certain symbols will have numbers in parentheses either above or below the symbol, which means that a specific number of those welds should be completed.
If you see a number placed within the actual weld symbol itself, this will refer to an angle between two beveled edges or the size of a root opening. However, if you see a whole number such as 45this refers to the total angle between two beveled edges. One possibility is a small flag symbol. In this case, the instruction is that you should perform the weld on-site, rather than doing it in a workshop.
The other alternative is a circle, which indicates that you should weld all the way around the joint. In other words, you should start and stop at the same point, just as a circle does. If the leader line bends in the case of bevel or J-groove weldsthis means that the arrow is pointing to an area which should be chamfered.
At the face of the weld symbol, you may see a small arc or straight line. This is supposed to tell you the finish that your weld should be left with. A concave arc should result in a concave finish; a convex arc should result in a convex finish; a flat line should result in a flat finish.
If a small what is a number in welding or rectangle can be found on the opposite side of the reference line to the weld symbol, this suggests that a backing strip should be placed on the other side of the joint. If a back weld is needed, it will be indicated by a small semi-circle on the other side of the reference line to the weld symbol. Flash and upset welds are depicted by a single vertical line crossing straight through the reference line. A row of asterisks or stars indicates that resistance spot welds should be used; resistance seam welds are pictured with a pattern that resembles overlapping zigzag lines what is a functional resume sample a row of small diamonds.
If you see a flush contour symbol with one of these welds, then you should remember to make the exposed surface flush. For example, if a particular process or a type of welding is needed, then a short code is written inside the tail to indicate which process to use. A full list of the processes and their codes is included below. If there are welding symbols and numbers on both the top and bottom of the reference line, but they do not line up perfectly, then this indicates that the welds should be staggered along the length of the joint.
If you see a number not a fraction next to an arc spot weld, this refers to the strength of the weld itself. Remember that this is a minimum value; it is usually measured in pounds or newtons per spot weld.
These are used when the instructions are slightly more complicated, and a few more steps are needed with each weld. In these cases, each horizontal line indicates a separate step which needs to be completed. The closer the line to the point of the arrow, the earlier you should complete that step; the further away from the point of how to get youtube to work in school arrow the instruction is, the later you should leave it.
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Base Metals: The P Number
Mar 01, · A numbers are groupings for the ferrous metal weld deposits. In certain circumstances you can use the A number determined by the filler metal manufacturer. In other cases, such as when welding dissimilar metals, you have to send a section of the weld deposit out for chemical analysis and then see what A number it matches. Electrodes for welding have numbers stamped on them to identify the type and characteristics of the electrode as specified by the American Welding Society (AWS). The AWS number gives the welder complete information about the welding rod.
This article provides information about P number in welding procedure specification , welding performance qualification or any other ASME Code section that this number is used. P number assigned by ASME Code Section IX to the materials based their similarity and characteristic such as chemical compositions, weldability and mechanical property.
That why you do not see any material identification in the Welding Procedure Specification. What you see is the assigned P number. So your WPS can be used for group of material and not a single material. This P number assignment reduces the number of PQR remarkably. The assigned P Numbers to the materials addressed in the table QW In addition, you can find minimum specified tensile strength, group number , UNS number, ISO Group number, nominal composition and product form.
P number is essential variable for most welding process. Similarly it is an essential variable for welding performance qualification. The welding is not the only application of this P number assignment. UCS Did you find this article useful? We will be updating and growing this site with more and more of industrial inspection related articles.
Please subscribe to my monthly newsletter so you don't miss a thing. Search this Site! More than Articles! Inspection 4 Industry LLC. P number in Welding This article provides information about P number in welding procedure specification , welding performance qualification or any other ASME Code section that this number is used.