A 3mm bead is half the size od a 6mm bead, however in welding you have to also add in penetration. A 3mm bead with a penetration of 100% is equal in size to a 50% penetration 6mm bead. 1/2"*3mm=1.5mm; 1/4"*6mm =1.5mm
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3 is larger than 0.8
1 cm = 10 mm 2 cm = 20 mm 3 cm = 30 mm . . 9 cm = 90 mm That's more than 77 mm.
35 mm. it equals 3.5 cm which is longer than 3 cm
4
3 mm is about an eighth of an inch; 7 mm is a bit more than a quarter inch.