Exothermic welding is a kind of simple, high efficiency, high quality metal connection technology, which USES metallic compound chemical reaction heat as a heat source, through the (reduction) molten metal overheating, direct or indirect heating work, in a special graphite mould cavity form a certain shape, size, the welded joint meets the engineering requirements. At present, exothermic welding has generally replaced the previous mechanical connection between metals. Jetta hot flux is safe and non-toxic, green and environmental protection.