| 摘要 |
PROBLEM TO BE SOLVED: To provide a control unit in flowing-out amount of gas for melt-cutting a steel plate with which the gas for melt-cutting can be controlled so as to always stably and surely obtain a prescribed mixed ratio in a simplified constitution without depending on man power. SOLUTION: A control part 12 controls a flowing-out amount adjuster 11 composed of a gas flow rate adjusting valve, etc., so that the mixed ratio of propan gas to supplied hydrogen gas is kept constant by receiving detected data of the hydrogen gas detected with a gas flow rate detector 9 and reading out mixing set value data from a memory 15.
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