[22] See [Chapter VIII].
Making Seams and Joints.
—The next thing to do after having cut out the different pieces of metal is to put them together. The way you do this will again depend very largely on the thickness of the metals, but in any event where the pieces meet, a seam or a joint must be made.
| A—LAP SEAM | B—GROOVED SEAM | C—LAP SEAM RIVETED |
| D—BUTT JOINT BOLTED | E—BOX LAP JOINT | F—BOX GROOVED SEAM | G—BUTT & PIECED JOINT |
| H—CORNER BUTT JOINT SCREWED | I—CIRCULAR LAP SEAM | J—CIRCULAR FOLDED SEAM | K—CIRCULAR OVERFOLD SEAM |
Fig. 29. how metal seams and joints are made
If the metal is thin the pieces can be lapped and then soldered or riveted together as shown at [A in Fig. 29] or you can make a folded seam as shown at [B]. If, however, the metal is thick you can make a lap seam and either rivet or bolt it together with screws having nuts on them as shown at [C].
A strong butt seam can be made by hard soldering or brazing the edges together but it takes a hot flame and considerable skill to do a good job of this kind. Another way to make a butt seam of two thick sheets of metal is to lay them with their edges together and then rivet a strip or plate on both sides of them as shown at [D.]
In making corner joints one or both edges of the sheet should be bent over as pictured at [E] when they can be soldered, riveted or bolted together; or a grooved seam can be made as shown at [F] if the metal is thin enough.
If the pieces of metal are say ¹⁄₁₆ inch or more thick you can put a three cornered piece of metal in the corner and drill and thread it so that the pieces which form the butt joint can be screwed to it as shown at [G], or if one of the pieces is thick enough you can drill and thread it and screw the other piece to it as shown at [H].