Certain operations require a specific welding process, a particular type of electrode, or other information nec­essary to complete the weld. In this case, a note can be placed in the tail of the reference line (using standard welding abbreviations), Figure 10.25.

Note that the term “back gouge” indicates removal of weld metal and base metal from the other side of a partially welded joint. This ensures complete joint penetration when weld­ing the gouged side of the joint.

There are circumstances when weld sym­bols are not added to the reference line of a welding symbol. This may occur when the drawing permits optional joint preparation with only complete penetration specified. This is so indicated by placing the letters “CJP” in the tail of the arrow and omitting the weld symbol, Figure 10.26. A note is added to the print that signifies this option.

It should be noted that when the letters “CJP” are found in the tail of the arrow, a complete joint penetration weld is required regardless of the type of weld or joint preparation that is used.

The welding symbol may not always be adequate to denote the weld required, such as for skewed joints (joints that deviate from a straight line). When this is the case, a cross section or detail drawing of the joint and shape of the weld is shown on the print. Data, in the form of notes, may be added to the drawing to further clarify the joint or weld required. Refer­ence is made to the detail or section drawing by a note or notes added to the reference line of the welding symbol with an arrow side, other side, or both sides significance, Figure 10.26 and Figure 10.27. In such cases, a weld symbol is not shown on the reference line.

A weld symbol may be omitted from the reference line if the type of joint preparation is not specified. The weld size is indicated on the desired side(s) of the reference line, Figure 10.28.