Resistance to cold cracking of welded joints made of P460NL1 steel

The results of investigations of resistance to cold cracking of high strength steel welded joints have been presented. The steel used was P460NL1 which is designed to work under pressure. Welding was carried out with coated electrodes (MMA) and flux cored wire by FCAW method. Parameters changed in the implant test were diffusible hydrogen content and weld heat input. Partial resistance to cold cracking of joints for the studied ranges of welding parameters have been shown. Cold cracking resistance decreases with increasing diffusible hydrogen content in the joint and increasing the cooling rate in the HAZ metal measured by cooling time in the temperature range 800-500°C.