Optimization of Laser Transmission Joining Process Parameters on Joint Strength of PET and 316 L Stainless Steel Joint Using Response Surface Methodology

Table 4

Analysis of variance (ANOVA) for joint strength.

Source	Sum of squares	DF	Mean square	value	value; Prob. >
Model	2900.84	9	322.32	1046.19	<0.0001	Significant
(power)	1281.26	1	1281.26	4158.79	<0.0001
(joining speed)	634.37	1	634.37	2059.06	<0.0001
(stand-off distance)	53.67	1	53.67	174.22	<0.0001
	3.46	1	3.46	11.23	0.0074
	4.26	1	4.26	13.84	0.0040
	15.18	1	15.18	49.27	<0.0001
	26.85	1	26.85	87.15	<0.0001
	57.11	1	57.11	185.38	<0.0001
	883.86	1	883.86	2868.89	<0.0001
Residual	3.08	10	0.31
Lack-of-fit	2.14	5	0.43	2.27	0.1942	Not significant
Pure error	0.94	5	0.19
Cor. total	2903.92	19
Std. dev.	0.56		-squared		0.9989
Mean	80.84		Adj. -squared		0.9980
C.V. %	0.69		Pred. -squared		0.9939
PRESS	17.60		Adeq. precision		103.941