STEEL MATERIAL FUSION-CUTTING DEVICE AND STEEL MATERIAL FUSION-CUTTING METHOD

To provide a steel material fusion-cutting device and a steel material fusion-cutting method which can perform gas fusion-cutting with 100% of hydrogen gas and easily adjust the burner height to a proper position.SOLUTION: A steel material fusion-cutting device comprises: an oxygen gas supply pipe which is connected with an oxygen gas supply source; a first pipe which is connected with a combustible mixed gas supply source; a second pipe which is connected with a hydrogen gas supply source; a combustion gas supply pipe which is connected with the first pipe and the second pipe via a switching mechanism; and a burner which is connected with the oxygen gas supply pipe and the combustion gas supply pipe. The switching mechanism can alternatively switch between the first state where the first pipe communicates to the combustion gas supply pipe and the second state where the second pipe communicates to the combustion gas supply pipe.SELECTED DRAWING: Figure 2 【課題】水素ガス１００％でガス溶断を行うことが可能で、かつ、火口高さを容易に適切な位置に調整可能である鋼材の溶断装置、および、鋼材の溶断方法を提供すること。【解決手段】酸素ガス供給源が接続された酸素ガス供給管と、可燃性混合ガス供給源が接続された第１の管と、水素ガス供給源が接続された第２の管と、前記第１の管および前記第２の管が切換機構を介して接続された燃焼ガス供給管と、前記酸素ガス供給管と前記燃焼ガス供給管とがそれぞれ接続された火口と、を備える溶断装置である。前記切換機構は、前記第１の管と前記燃焼ガス供給管とが連通する第１の状態と、前記第２の管と前記燃焼ガス供給管とが連通する第２の状態とを、択一的に切換可能である。【選択図】図２