Investigation of the Effects of Submerged Arc Welding Process Parameters on the Mechanical Properties of Pressure Vessel Steel ASTM A283 Grade A

Table 5

Analysis of variance for hardness.

Source	DF	Seq SS	Adj SS	Adj MS
Current	2	579.89	579.89	289.95	32.62	0.000
Voltage	1	26.64	26.64	26.64	3.00	0.096
Travel speed	1	831.27	831.27	831.27	93.52	0.000
Current voltage	2	550.19	550.19	275.09	30.95	0.000
Current travel speed	2	389.06	389.06	194.53	21.89	0.000
Voltage travel speed	1	587.50	587.50	587.50	66.10	0.000
Current voltage travel speed	2	213.66	213.66	106.83	12.02	0.000
Error	24	213.32	213.32	8.89
Total	35	3391.52
	%			%