The HAZ subzones were produced using two techniques: standard furnace and GleebleRTM machine. The lack of understanding in detail of the interaction between hydrogen and each HAZ subzone in implant testing led to the need of developing the test to obtain more data about the weldability. The charged hydrogen content for each weld was recorded against the applied load during weldability testing. A standardized weldability test known as implant test was constructed and used to study the susceptibility of the Q&T HSLA steel to hydrogen cracking. The results of this research study will be used to identify safe welding procedure and design more weldable material. The new vessels were constructed to increase the production of the plant and also to save weight for the larger pressure vessel. A number of leaking cracks developed in the girth welds of the pressure vessel after a short time of upgrading the material from plain carbon steel to Q&T HSLA steel. The purpose of conducting this research is to develop fundamental understanding of the weldability of the modern Quenched and Tempered High Strength Low Alloy (Q&T HSLA) steel, regarding the cracking behavior and susceptibility to environmental cracking in the base metal and in the heat affected zone (HAZ) when welded.
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