Mich. Admin. Code R. 408.13312a - Filter lenses

Rule 3312a.

(1) An employer shall ensure that each affected employee uses equipment that has filter lenses which have shade numbers appropriate for the work being performed for protection from injurious light radiation.

(2) Table 1 is a listing of appropriate shade numbers for various operations.

(3) Table 1 reads as follows:

TABLE 1 FILTER LENSES FOR PROTECTION AGAINST RADIANT ENERGY
OPERATIONS	PLATE THICKNESS (INCHES)	PLATE THICKNESS (MM)	MINIMUM* PROTECTIVE SHADE
Gas Welding:
Light	Under 1/8	Under 3.2	4
Medium	1/8 to 1/2	3.2 to 12.7	5
Heavy	Over 1/2	Over 12.7	6
Oxygen Cutting
Light	Under 1	Under 25	3
Medium	1 to 6	25 to 150	4
Heavy	Over 6	Over 150	5
OPERATIONS	ELECTRODE SIZE 1/32 IN.	ARC CURRENT	MINIMUM* PROTECTIVE SHADE
Less than 3	Less than 60	7
Shield metal	3 to 5	60 to 160	8
Arc welding	more than 5 to 8	161 to 250	10
more than 8	251 to 550	11
Gas metal arc welding and flux	cored arc	Less than 60 60 to 160	7 10
	welding	161 to 250	10
	251 to 500	10
Gas tungsten arc	Less than 50	8
	welding	50 to 150	8
	151 to 500	10
Air carbon	(Light)	Less than 500	10
Arc cutting	(Heavy)	500 to 1000	11
Plasma arc welding
	20 to 100	8
	101 to 400	10
401 to 800	11
Plasma arc cutting	(Light)**	Less than 300	8
	(Medium)**	300 to 400	9
	(Heavy)**	401 to 800	10
Torch brazing Torch soldering Carbon arc welding
	3
	2
	14

* As a rule of thumb, start with a shade that is too dark to see the weld zone. Then go to a lighter shade that gives a sufficient view of the weld zone without going below the minimum. In oxyfuel gas welding or cutting where the torch produces a high yellow light, it is desirable to use a filter lens that absorbs the yellow or sodium line in the visible light of the (spectrum) operation.

** These values apply where the actual arc is clearly seen. Experience has shown that light filters may be used when the arc is hidden by the workpiece.

Notes

Mich. Admin. Code R. 408.13312a

2014 AACS