Railway Engineering Test Welds to Qualify a New Flash Butt Welding Machine

Railway Engineering - Test Welds with a New Flash Butt Welding Machine
• Railway Engineering Te...
This video describes the sample welds and tests carried out to qualify a new flash butt welding machine. 7 sample welds were done and 5 are subjected to Slow Bending Test and 2 sample welds were subjected to Hardness Test.Ultra Sound Flow Detection Test was also done but not included in the video.
SlOW BENDING TEST- Minimum bend test deflection 20 mm and minimum bend test force 1520kn must be reached.
If the weld has not fracture at the specified minimum production test load and the minimum defection, it shall be deemed to have met the required standard.
HARDNESS TEST - two welds in finished condition shall be sectioned for hardness testing. The variation in hardness across the heat affected zone of each of the two welds shall be measured
using the Vicker hardness test (HV 30). Impressions to be on a line between 3mm and 5mm below the running surface on the vertical longitudinal axis of the rail. Spacing shall be at 2mm centers. The hardness traverse should extend into the unaffected parent rail no less more than 20mm.
If the welded joints are tested to be
qualified through hardness test and slow bend test, then the welded joints are considered as
qualified