Abstract: This electrolytic apparatus for a welding machine uses an electrolytic cell, a mixing tank and a multi-control switch. The electrolytic cell is composed of several pieces of electrode plates which are assembled in a row, the farthest side of which is connected to the positive and negative poles of electrolysis power. After electrolysis, the gas proceeds in a storage tank and the liquid is guided back into the electrolytic cell for recycling use. The fuel gas then goes into a first chamber to get rid of water. In the meantime, part of the fuel gas will be combined with carbohydrate dissolvent to alter its fuel composition and then be recombined with the rest of the gas to provide a desired fuel. This way, the heat of the gas can be heightened, flame temperature can be lowered, and the output ratio for the fuel gas can be controlled and adjusted to attain a welding gun's flame within a comprehensive scope of temperature and heat.