By N. Bailey, F.R. Coe, T.G. Gooch, P.H.M Hart, N. Jenkins and R.J. Pargeter (Auth.)
A entire advisor to fending off hydrogen cracking which serves as an important problem-solver for somebody considering the welding of ferritic steels. The authors supply a lucid and thorough clarification of the theoretical heritage to the topic however the major emphasis all through is firmly on perform
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Additional resources for Welding Steels Without Hydrogen Cracking
Sample text
In very small amounts. 2] with a multiplying factor of 5. Low hydrogen electrodes are normally required to produce the necessary strength and toughness, although sound welds can be made with rutile electrodes, especially in thin section. For steels not listed individually it is advisable to consult TWI to determine whether new information on weldability has become available. If much welding of an unlisted steel is envisaged, some experimental work to determine its transformation behaviour and susceptibility to cracking is recommended.
If by its Counsel thou wilt ruled be; Yea, it will make the slothful active be. The blind also delightful things to see. So far, the factors responsible for hydrogen-induced cracking have been described, the principles upon which safe welding procedures can be based have been outlined, and the information required before using a welding diagram has been listed. It is now possible to explain in this chapter 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.
These steels are generally of relatively low hardenability and can often be successfully welded with procedures similar to those used for C-Mn steels. Some of them, however, show different susceptibilities to hydrogen cracking at given HAZ hardness levels as compared with C-Mn steels. For example, a molybdenum-boron steel has a critical HAZ hardness of 375 HV instead of 350 HV when high and medium hydrogen processes are used. On the other hand, although differing in transformation behaviour, the Mn-Cr-Mo-V steel resembles C-Mn steel in critical hardness values.
