Miller Shielded Metal Arc Welding Manuallines - Strona 19
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3-15. Welding Vertical Beads And Butt Joints
Single Pass Bead Weld
Whipping Up
Motion
Weave Bead
1/2 in (12 mm)
Wide
Single Pass Vertical Butt Joint Weld Or
First Pass Of Multi-Layer Deposit
90°
Hesitate With
Slight Up And
Down Motion.
Shorten Arc At
Arrowheads
When At Center
Of Weld.
1/2 in
(12 mm)
2
90°
1st Pass
2nd Pass
OR
3rd Pass
Vertical Butt Joint Weld Subsequent Layers
.
When welding vertically,
gravity may distort the mol-
ten metal.
.
This technique is not
1
90°
suitable for all electrodes.
1
Electrode
2
Backing Strip
Weld vertically by carrying the
weld upward or starting at the top
and welding down. Welding up-
ward is easier and is shown in
these illustrations.
Bevel edges if warranted by ma-
terial thickness (see Section
3-11). Tack weld a backing strip
to the plates to make the first
weld pass (root pass) easier.
Arrows Show Lifting Up
Of Electrode And Return
To Crater.
4th Pass
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155 095 Page 17
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