The ability to read and understand weld symbols is very important in the manufacturing industry. Like other aspects of drafting, there’s a set of symbols for welding to simplify the communication between designer and builder (i.e. the welder).In this article, we will discuss various welding symbols and their meaning.
These figures represent the core structure of every drafting specification for a weld to be performed. The welding symbol has an arrow, which points to the location on the drawing where a weld is required. The arrow is attached to a leader line that intersects with a horizontal reference line. Finally, there's a tail at the opposite end of the reference line that forks off in two directions. The tail is optional and needed only for special instructions.
2.) If the weld symbol appears on top of the reference line, then the weld should be made on the opposite side of the joint where the arrow points.It is represented in the figure below.
3.) If the weld symbol appears on both sides of the reference line, as shown below, it specifies that a weld must be performed on both sides of the joint. This is represented in the figure below.
5.) A weld symbol may also specify an angle, root opening or root face dimension. This is common when the base metal to be welded on is thicker than 1/4 inch. The following example is a symbol and drawing calling for a V-groove joint:
Dimensions written below the reference line, of course, apply to the joint on the arrow side, while dimensions written above apply to the joint on the other side. In the image above, welds are indicated for both sides of the joint.
As you just saw in the case of the backing strip, the forked tail of the welding symbol is used to convey details that aren't part of the normal parameters declared on the reference line. For instance, the engineer or designer might want the welder to use specific welding ( for example SMAW), or another welding process. Or there may be other information to convey:
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Let us begin with the constituents of a welding symbol. A typical welding symbol is shown below.
TYPICAL WELDING SYMBOLS AND THEIR MEANING :
1.) The weld symbol may also be placed above the reference line, rather than below it. This placement is important. When the weld symbol hangs below the reference line, it indicates that the weld must be performed on the "arrow side" of the joint. For example, in the figure shown below, a fillet weld is specified on the arrow side. You can see the actual weld in the second depiction.
4.) Each type of weld has its own basic symbol, which is typically placed near the center of the reference line (and above or below it, depending on which side of the joint it's on). The symbol is a small drawing that can usually be interpreted as a simplified cross-section of the weld. In the descriptions below, the symbol is shown in both its arrow-side and other-side positions.
5.) A weld symbol may also specify an angle, root opening or root face dimension. This is common when the base metal to be welded on is thicker than 1/4 inch. The following example is a symbol and drawing calling for a V-groove joint:
6.) Sometimes, a series of separate welds is specified, rather than a single long weld. This is common when thin or heat-sensitive metals are welded on, or where the joint is a really long one. In the following symbol and drawing, 3-inch intermittent fillet welds are specified and shown in figure below.
7.) Numbers are also a big part of a welding specification. The width, depth, root opening and length of a weld, as well as the angle of any beveling required on the base metal before welding can all be communicated above or below the reference line.
In most cases, the weld width (or diameter) is located to the left of the weld symbol (expressed here in inches), while its length is written to the right. (The weld's width is the distance from one leg of the weld to the other.) Often, no length is indicated, which means the weld should be laid down from the beginning to the end of the joint, or where there's an abrupt change in the joint on the base metal.
In most cases, the weld width (or diameter) is located to the left of the weld symbol (expressed here in inches), while its length is written to the right. (The weld's width is the distance from one leg of the weld to the other.) Often, no length is indicated, which means the weld should be laid down from the beginning to the end of the joint, or where there's an abrupt change in the joint on the base metal.
Dimensions written below the reference line, of course, apply to the joint on the arrow side, while dimensions written above apply to the joint on the other side. In the image above, welds are indicated for both sides of the joint.
8.) Optional Tail = Special Instructions
As you just saw in the case of the backing strip, the forked tail of the welding symbol is used to convey details that aren't part of the normal parameters declared on the reference line. For instance, the engineer or designer might want the welder to use specific welding ( for example SMAW), or another welding process. Or there may be other information to convey:
Of course, when no special instructions are needed, the tail is omitted from the welding symbol, leaving just the reference line, arrow and leader line.
Apart from these, there are other symbols but these are some of the mandatory symbols that every welding specification contains.
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Bro... Now a days there is less number of facts only posted.
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Why reference line is there?
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