Abstract
This study aims to investigate the influences of in-service welding conditions on maximum HAZ hardness, namely heat input, pipe wall thickness, and medium flow rate. The research consists of two parts; computationally thermal analysis and actual welding experiments. In conclusion, it suggested that increasing heat input resulted in decreasing maximum HAZ hardness, as well as, the range of run pipe thickness in the experiment was insignificantly influenced on HAZ hardness. Additionally, the higher flow rate induced more HAZ hardness with a certain flow rate level. HAZ hardness between the sleeve plate and the run pipe was insignificantly different. Nevertheless, it indicated that HAZ hardness prediction via computational analysis was more conservative than experiments.
Highlights
The In-service welding is widely accepted solution for pipeline repairing that can be applied onto pressurized pipeline and non-stopping natural gas transportation
This research investigated the influences of the inservice operating conditions on HAZ hardness, namely welding heat input, run pipe thickness, and medium flow rate
2) In this case, HAZ hardness was insignificantly influenced on the range of run pipe thickness from 4 to 8 mm
Summary
The In-service welding is widely accepted solution for pipeline repairing that can be applied onto pressurized pipeline and non-stopping natural gas transportation. When the system cannot be isolated or shut down. Welding onto lived pipeline can cause Hydrogen Induced Cracking (HIC)[1,2,3] due to the flowing fluid within the system. Avoiding hydrogen induced cracking is undertake through reducing HAZ hardness. There is unclear main effect of individual welding conditions on HAZ hardness. The limited welding parameters are capable to select to meet the desire conditions
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