| 摘要 |
1496139 Welding by fusion; brazing FLAMEX AG 25 Nov 1974 [23 Nov 1973 22 Aug 1974] 50976/74 Heading B3R [Also in Division C5] A fuel gas composition which may be used for welding and brazing metals comprises natural gas and a hydrocarbon vapour which is present in an amount from 0À1% by volume to saturation, the hydrocarbon being one which is normally liquid and containing 5-20 carbon atoms; the fuel composition is capable of generating a flame hotter than that of natural gas alone. The hydrocarbon additive may be an aromatic compound, a C 5 -C 8 alkane, a C 5 -C 6 cycloalkane, or a C 5 -C 8 alkene. Numerous examples of suitable hydrocarbons are given. Preferred are (a) a mixture of 1,5- hexadiene and 3,3-dimethyl-1-butene and (b) a mixture of n- and iso-pentane and hexanes. |
