Bead Welds

WELDING OPERATIONS I - OD1651 - LESSON 1/TASK 1

more than 15 degrees above the horizontal for proper molten metal

control. The arc should be held short to obtain good fusion and

penetration.

(b) When welding tee joints in the vertical position, the joint

should be started at the bottom and welded upward and the

electrode should be moved in a triangular weaving motion as shown

in figure 22, view A, on the previous page.

A slight pause in

the weave, at the points indicated, will improve the sidewall

penetration and provide good fusion at the root of the joint.

1 If the weld metal should overheat, the electrode should

be

quickly shifted away from the crater without breaking the arc

as

shown in figure 22, view B. This will permit the molten metal

to

solidify without running downward.

The electrode should

be

returned immediately to the crater of the weld in order

to

maintain the desired size of the weld.

2 When more than one pass is necessary to make a tee weld,

either of the weaving motions shown in figure 22, views C and D,

may be used. A slight pause at the end of the weave will develop

good fusion without undercutting at the edges of the plates.

(c) To make welds on lap joints in the vertical position, the

electrode should be moved in a triangular weaving motion as shown

in figure 22, view E.

The same procedure for making the tee

joint is used except the electrode is directed toward the

vertical plate marked "G" in figure 22, view E. The arc should

be held short, and the pause at the surface of plate "G" should

be slightly longer. Care should be taken not to undercut either

of the plates or to allow the molten metal to overlap at the

edges of the weave.

(d) Lap joints in the vertical position on heavy plate require

more than one layer of metal.

The deposited bead should be

thoroughly cleaned and subsequent beads deposited as shown in

figure 22, view F.

i. Overhead

Position

Welding

(figure

23

on

the

following

page).

(1) Bead Welds.

The overhead position is the most difficult

position to weld in because it

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