Abstract
This chapter discusses the selection of safe welding procedures for different steel types. The welding procedures derived in this book were intended to give a high degree of protection against the risk of hydrogen cracking in weld HAZs. In 1974, when incorporation of the procedures into the British Standard for welding structural steels was discussed, comparison of the TWI data with the experience of the British structural steel fabrication industry showed that the TWI procedures were more conservative than had been used successfully up to that time. It appeared that the discrepancy could be removed if the TWI procedures were made appropriate to steels of 0.02 CE higher and this difference was put into the standard, so that the procedures for a steel of, say, 0.45 CE in the present text were equivalent to those of a steel of 0.47 CE in BS 5135: 1974.
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