By N. Bailey (Auth.)
This ebook is mainly all in favour of the traditional fusion welding techniques and their difficulties and may be of price to functional welding engineers, inspectors and metallurgists. the writer additionally has inmind the desires of these occupied with layout and specification, recognising the significance of facing difficulties on the layout degree
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Extra resources for Weldability of Ferritic Steels
Example text
11] Other formulae for the yield and tensile strengths of submerged arc weld metal are given in ref. 19. These equations should not be used for weld metal which has been normalised or quenched and tempered, because of the loss of srrengrh of weld metals after heat treatments involving heating within the austenite range. e. generally above about 750 "C. '" It is important to be aware of this loss of strength. as it requires a special selection of welding consumables, generally of 38 Wcldability of ferritic stcels similar carbon content to that of the parent steel.
G. 5%) is being joined to a simple medium carbon steel. then the requirements of the latter for preheat to avoid hydrogen cracking need to be taken into consideration. although some degree of compromise may be required. It will usually be helpful to use consumables giving ultra-low hydrogen levels. I t may also be necessary to allow higher preheat and interpass temperatures than are normally acceptable for the tougher steel. on the grounds that full HAZ toughness of the higher strength steel will not be required at the dissimilar joint.
Unlike solidification cracking. there has been little effort to quantify compositional effects on liquation cracking in the HAZ. because it is normally a minor problem. Reheat cracking Reheat o r stress relief cracking is limited to a few steels and no attempts appear to have been made to develop universal formulae for this type of cracking. However some formulae have been developed for parameters (AG and PSR)showing the susceptibility to cracking of ferritic steels when clad with austenitic stainless steels and then subjected to PWHT.
