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proportions. The number of beads is determined by the thickness of the metal being welded. 

Plates from 1 ⁄ 8 -inch to ¼-inch can be welded in one pass, but they should be tacked at intervals to keep them aligned. Any weld on a plate thicker than ¼-inch should have the edges beveled and multiple passes. 

The sequence of the bead deposits is determined by the kind of joint and the position of the metal. All slag must be removed from each bead before another bead is deposited. 

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Typical multiple-pass groove welding of butt joints is shown in Figure 5-34 . 

## Techniques of Position Welding 

Each time the position of a welded joint or the type of joint is changed, it may be necessary to change any one or a combination of the following: 

• Current value 

• Electrode 

• Polarity 

• Arc length 

• Welding technique 

Current values are determined by the electrode size, as well as the welding position. Electrode size is governed by the thickness of the metal and the joint preparation. The electrode type is determined by the welding position. Manufacturers specify the polarity to be used with each electrode. Arc length 

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