13 Weld Bead Appearance Two characteristics of the weld bead are the bead height and width, as shown in Figure 7-13. These characteristics are important to assure that the weld joint is properly filled, with a minimum of defects, particularly in multi-pass weldments. In this case, if the bead height is too great, it becomes very difficult to make subsequent weld passes that will have good fusion. The more peaked and narrow the weld bead, the greater the chance that poor fusion may occur. The weld bead characteristics may be altered via both size and shape. In order to change weld bead size, the lbs. (kg) of weld metal deposited per linear foot (m) of the weldment must be changed. Welding current and travel speed are the welding parameters primarily used to control weld bead size. For instance, when the current is decreased, the weld bead will become smaller. The converse is also true. This relationship can be seen by referring to Figure 7-7. Weld bead size can also be changed by varying the arc travel speed. As seen in Figure 7-9, bead size and travel speed are inversely related. A decrease in travel speed will result in an increase in the weld bead height and width. An increase in travel speed will result in a decrease in the weld bead height and width. Again, the pounds (kgs) of filler metal deposited in a linear foot (m) of weld are increased (or decreased). Both welding current and travel speed have little effect on weld bead shape. The bead width and height increase or decrease together. Continued on next page... Figure 7-13 – Weld Bead Characteristics
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Weld Bead
Torch Position
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