WELDING OPERATIONS I - OD1651 - LESSON 1/TASK 1
(3) Edge Joint (figure 6, views E, F, and G on the previous
This type joint is used to join two or more parallel
members such as edges of sheet metal, angles, mufflers, liquid
tank containers, assembly housings, and reinforcing plates in
flanges of I beams.
Two parallel plates are joined together as
shown in figure 6, view E.
On heavy plates, sufficient filler
metal is added to fuse or melt each plate edge completely and to
reinforce the joint. Light sheets are welded as shown in figure
6, view F. No preparation is necessary other than to clean the
edges and tack weld them in position.
The edges can then be
The heavy plate
joint shown in figure 6, view G, requires that the edges be
beveled for good penetration and fusion of the side walls.
(4) Lap Joint (figure 6, views H, I, and J).
This type of
joint is used to join two overlapping members.
A single lap
joint, where welding must be done from one side, is shown in
figure 6, view H. The double lap joint shown in figure 6, view
I, is welded on both sides and develops the full strength of the
welded members. The offset lap joint shown in figure 6, view J,
is used where two overlapping plates must be joined and welded in
the same plane. The offset lap joint is stronger than the single
lap type, but is more difficult to prepare.
(5) Tee Joint.
Tee joints are used to weld two plates or
sections whose surfaces are located approximately 90 degrees to
each other at the joint.
A plain tee joint welded from both
sides is shown in figure 6, view L. A plain tee joint, requiring
only cleaning the end of the vertical plate and the surface of
the horizontal plate, is shown in figure 7, view A, on the
The single bevel joint shown in figure 7, view
B, is used in plates and sections up to 1/2 inch thick.
double bevel joint shown in figure 7, view C, is used on heavy
plates that can be welded from both sides.
The single J joint
shown in figure 7, view D, is used for welding plates 1 inch
thick or heavier where welding is done from one side. The double
J joint shown in figure 7, view E, is used for welding very heavy
plates from both sides.