Welding Rod. Material used to supply additional metal to the weld. (See [Filler-rod].)
LECTURES
Note.—In order to determine whether the student is obtaining the information desired it is sometimes thought fitting to give written examinations. These serve as an index as to what the student has learned and what he has not. They also let the instructor know whether he is making every point clear in his training.
The following questions fit in with each chapter or part thereof and are merely a suggestion for the instructor who has no course of training outlined. With one or two exceptions all answers to these questions may be found within the manual. There are a few misleading questions purposely inserted to see if the student is thinking for himself.
LECTURE NUMBER ONE
Subject—Apparatus
1. Name the different classes into which oxy-acetylene welding apparatus may be divided and explain the principles upon which this classification depends.
2. Illustrate by line sketches the various locations of the mixing chambers for the oxygen and acetylene gases in welding torches.
3. (a) Where is the logical location for the mixing chamber in welding torches employed in automobile and tractor repair work?
(b) Give reasons for so thinking.
4. How is the torch and the welding tips treated after repeated “flash-backs” have taken place?