Equipment and Material Requirements
do all the work covered in this chapter, you need a complete welding and cutting
outfit, as described
at the start of Chapter 5. At least two or three different welding heads (tips)
are needed. For welding 1/ 16-
in. sheet, you need one which is rated to consume about 4 cfh (cubic feet per
hour) of each gas. For welding 1/ 8-in.
steel, a head one or two sizes larger (consuming 6-9 cfh) is needed; this size
will also be suitable for 2-in. or smaller
pipe. For welding 1/4-in. plate, or 4-in. pipe, a head rated to consume 15 cfh
of each gas is recommended. For
bevelling plate or pipe with your torch, a cutting nozzle with cutting oxygen
orifice drill size 60 or a little smaller is
recommended. In addition, you need a suitable welding table (slotted cast iron
or fire brick top), some C-clamps, and
pliers or tongs for handling hot metal. For pipe-welding practice, two useful
work-holding devices which you can
make for yourself are pictured in Fig. 13-20. Materials:
For practice on sheet steel, we recommend that you secure several
pieces of sheet, at least 4 in. by 4 in.
(10 cm by 10 cm) in size, and not thinner than 16 gauge (1/16 in. or 1.5 mm).
(Sheet as thick as 1/8 in. will also be
satisfactory.) For practice on plate, several pieces 6 x 9 in. (15 x 22 cm), about
1/4-in. (6 mm) thick, are suggested.
For pipe welding practice, we suggest short lengths (or one length, 4-6 feet,
which you can cut yourself) of
standard (Schedule 40) seamless steel pipe, 2 in. to 4 in. diameter. (The larger
size is preferable, if you can secure
it.) You will
also need a supply of steel welding rod. For sheet metal practice, 1/16-in. diameter
rod is suggested. For plate
and pipe welding, either 1/8-in. or 3/32-in. diameter rod will be satisfactory.
Two types of steel rod which will serve
your purposes are generally available. One is sometimes termed drawn iron
because it is more than 99% iron;
it falls into A.W.S. Class RG45. (OXWELD No. 7 rod is an example of this type.)
The other is usually designated
as No. 1 HT, contains about one per cent manganese, and falls into
A.W.S. Class RG60.