Comparative study of tube to tubesheet welding qualification on heat exchanger

Journal of Engineering and Applied Science

Table 3 Process parameters for P no.1 vs. P no.8

Tube no	Weld layer	Current (Amp)	Voltage (volts)	Travel speed (mm/min)	Avg heat input KJ/mm
Tube 1	RP	97–98	8.8–9.5	74	0.7233
Tube 1	HP	100–101	9.6–10.2	64	0.932
Tube 2	RP	96–97	9.0–9.6	75	0.717
Tube 2	HP	100–101	9.2–9.7	72	0.787
Tube 3	RP	96–97	8.8–9.2	70	0.744
Tube 3	HP	100–101	9.8–10.8	70	0.887
Tube 4	RP	96–97	8.8–9.5	74	0.715
Tube 4	HP	99–100	9.5–10.2	57	1.036
Tube 5	RP	96–97	8.8–9.5	74	0.715
Tube 5	HP	99–100	9.5–10.2	57	1.036
Tube 6	RP	95–97	8.5–9.4	79	0.655
Tube 6	HP	100–101	9–10	67	0.855
Tube 7	RP	96–97	8.6–9.4	55	0.947
Tube 7	HP	101–102	9.2–10	83	0.660
Tube 8	RP	97–98	9.2–10.2	52	1.09
Tube 8	HP	101–102	9–9.8	81	0.706
Tube 9	RP	96–97	9–9.8	55	0.989
Tube 9	HP	100–101	9.5–10.2	68	0.873
Tube 10	RP	96–97	9–9.8	55	0.989
Tube 10	HP	100–101	9.5–10.2	68	0.873