Abstract
The existing possibilities of steelmaking imply that ultra low sulfur contents can be obtained. The weldability of these steels had not yet been clearly defined as good or not. In this study the welding behavior has been determined both for normalized steels, and quenched and tempered steels. Results concern underbead hardness in the heat affected zone (HAZ) and critical preheat temperature determined by the implant test. Ultra low sulfur steels appear to present a significant improvement in weldability. The underbead hardness is not affected by a sulfur content decrease. The preheat temperature is the same for different stress directions (that is, longitudinal and short transverse) only for steels with a sulfur content lower than about 15/20 ppm. The influence of the weld metal's hydrogen content on cold cracking prevention is reduced with ultra low sulfur steels.
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