고급용접기호 2편 Advanced WeldingSymbols

FILLET WELDS

 

A welding symbol for a fillet weld includes the required fillet weld symbol and (as needed) the size, length, pitch, contour, method of making the contour, weld all around, field weld, and any other supplemental information listed in the tail of the welding symbol. See Figure 10-14. The size of the fillet weld is shown to the left of the weld symbol. It represents the length of the legs of the largest right triangle that can fit within the joint, with the vertex of the triangle located at the intersection of the two members being joined. See Figure 10-15.

 

 

 

UNEQUAL LEG FILLET WELDS

 

A fillet weld can be required to have unequal legs. In such cases, the size for each of the legs is shown on the welding symbol to the left of the weld symbol and is written in parentheses. The only way to know which leg goes with which size is through either a detail drawing that shows the weld joint, as in Figure 10-16; a note; or other revealing information, such as one of the legs is required to be longer than one of the sides, as in Figure 10-17.

 

 

GROOVE WELDS

 

The components of a welding symbol for a groove weld include the required groove weld symbol for the type of groove weld called for and may also include, as needed, the size, depth of preparation, root opening, groove angle (also called included angle) contour, method of making the contour, length, pitch, weld all around, field weld, and any other supplemental information listed in the tail of the welding symbol. See Figures 10-18 and 10-19.

 

 

MELT-THROUGH

 

Melt-through is defined by the American Welding Society (AWS) as “visible root reinforcement produced in a joint welded from one side.” In other words, meltthrough is the penetrated weld metal that extends beyond the base metal on the back side of a joint welded from the opposite side. Height, contour, method of contour, and tail specifications are all supplemental types of information that can be added to the melt-through weld symbol. See Figures 10-20 and 10-21.

 

 

CONSUMABLE INSERT

 

A consumable insert is preplaced filler metal that is fused into the root of the joint. Consumable inserts come in five different classes. The five classes correlate to the following 5 shapes:

 

1. Class 1: Inverted T cross section

2. Class 2: J shaped cross section

3. Class 3: Solid ring shape

4. Class 4: Y shaped cross section

5. Class 5: Rectangular shaped cross section

 

The class number (1, 2, 3, or 5) required for the application should be shown in the tail of the welding symbol, as in Figure 10-22. AWS A5.30/A5.30M:2007 Specification for Consumable Inserts further defines and specifies the requirements of the five classes of consumable inserts.