Advantages of the Green Solid State FSW over the Conventional GMAW Process

Table 2

The amounts of the released gases in the welding area prior to and after welding.

Number of tests	Atmosphere		GMAW		FSW
	Carbon monoxide [ppm]	Carbon dioxide [ppm]	Carbon monoxide [ppm]	Carbon dioxide [ppm]	Carbon monoxide [ppm]	Carbon dioxide [ppm]
1	0.4	121	2.8	361	0.5	197
2	0.3	118	2.0	354	0.3	241
3	0.5	122	2.2	344	0.6	196
4	0.7	119	2.7	338	0.7	201
5	0.9	117	3.9	333	1.0	223