Procedure

The product requirements are as defined below:
1. Cromotherme 1 RTE: After minimum PWHT (for 1 Hour per inch) average impact value should be 55J and no single value should be less than 47J.

2. Cromotherme 2 RTE:
1) After minimum PWHT (for 1 Hour per inch) average impact value should be 55J and no single value should be less than 47J.
2) Should meet the requirements of API 934a after step cooling.

Analysis
The welding and testing should be closely monitored to find the root cause of the problem. The following points were observed:
1. Current, Voltage, and speed need to be optimized to get the desired results.
2. Preheat and IPT need to be closely monitored and controlled
3. Every layer thickness should be minimized to get the temper bead effect in every pass
4. PWHT cycle timings should be optimized
5. The notch of the test specimen should be as per standard.

JOB DESCRIPTION & APPLICATION:
Customer is also satisfied with results and gave further order of the same product. Also, D& H Secheron become the first Indian company to supply the welding consumable for P22 grade that satisfies the step cooling requirements as per API 934a with PWHT of 1 Hour/inch.