14. Describe fully the manner in which two cast-iron bars measuring 1 × 6 inches and 24 inches long, are welded end to end, citing preparations, precautions, and the procedure and materials necessary to execute and carry the weld through to a cool state.
Note.—Both gases are in the line hoses as far as the welding torch.
LECTURE NUMBER SIX
Subject—Welding of Cast Iron
(Part Four)
15. (a) Are water jackets on cast-iron cylinder blocks welded in a cold, or a preheated condition?
(b) Is this true under all conditions?
(c) If a crack were found in the combustion head of a cylinder block and the entire water jacket and cylinder were cast in one, how should this job be prepared in order to make a successful weld?
(d) In welding a broken lug on the base of a cylinder block how should lug appear after weld is cold?
LECTURE NUMBER SEVEN
Subject—Equipment
1. Describe the operation, step by step, taken to set up an oxy-acetylene welding plant, from the assembling of the parts, right through, until a neutral welding flame is obtained. (If a sketch, with the gas cylinders and parts numbered 1, 2, 3, etc., will assist in making description clear, it may be used.)
2. (a) Is it desirable to have a planed metal, or a brick-top table for welding purposes?