66 Gas Metal Arc Welding Handbook
Single fillet
Double fillet
Bevel and fillet
Figure 6-28. Various types of T-joints and welds.
Size of
required
weld
Leg length
Figure 6-29. Fillet weld leg lengths from the root of the joint
should be equal. Unequal leg length, unless otherwise speci-
fied, will not carry the designed load and may fail under stress.
Section B
Incorrect design
Section A
Correct design
Correct
Correct
Open to
corrosion
Figure 6-30. Corrosive liquids must not be allowed to enter the
penetration side of the weld joint. In Section A, the back of the
weld is closed to corrosion. In Section B, the back of the weld
is open to corrosion.
Figure 6-31. Lap joint problem areas that result from improper
fit-up.
Outer part
Inner part
O.D.
I.D.
Figure 6-32. The diameters of the parts to be assembled with
an interference fit may be found by using a “pi” tape around the
inner and outer cylinder components. The tape measures in
thousandths of an inch and full inches.