Tweco Auto Darkening Welding Helmet Manuel d'utilisateur télécharger pdf (Page 18)

INTRODUCTION AUTO-DARKENING WELDING HELMET

2-3 Manual 0-5045

2.06 Personal Protection

WARNING

Prior to welding check operation of the ﬁlter lens, if the lens does not darken DO NOT COMMENCE WELDING.

If during welding the ﬁlter does not darken IMMEDIATELY STOP WELDING.

The radiation from an electric arc during the welding process can seriously harm eyes and skin. It is essential that

the following precautions be taken:

When electric arc welding, it is a requirement to use a welding helmet or welding handshield that complies to a relevant

standard. Protective ﬁlter lenses are provided to reduce the intensity of radiation entering the eye thus ﬁltering out

harmful infra-red, ultra-violet radiation and a percentage of the visible light. Such ﬁlter lenses are incorporated into

this Welding Helmet. To prevent damage to the ﬁlter lenses from molten or hard particles an additional hard clear

glass or special plastic external cover lens is provided. This cover lens should always be kept in place and replaced

before the damage impairs your vision while welding.

It is important to ensure that the helmet is adjusted to the correct shade level prior to the commencement of welding.

The table below can be used as a guide to select the ﬁlter lens shade level for differing applications.

Welding Process Arc Current in Amps Recommended Shade

Manual Metal Arc Welding (Stick)

60 − 100 #9

100 − 150 #10

150 − 200 #11

200 − 300 #12

300 − 450 #13

Gas Metal Arc Welding (Mig) with Heavy Metals

Less than 125 #9

125 − 175 #10

175 − 250 #10

250 − 350 #12

350 − 450 #13

Gas Metal Arc Welding (Mig) with Light Alloys

Less than 175 #10

175 − 225 #11

225 − 300 #12

300 − 400 #13

Gas Tungsten Arc Welding (Tig)

30 − 70 #9

70 − 125 #10

125 − 200 #11

200 − 300 v#12

300 − 350 #13

Air – Arc Gouging

Less than 175 #10

175 − 200 #11

200 − 250 #12

250 − 350 #13

Plasma Arc Cutting

Less than 125 #9

125 − 150 #10

150 − 175 #11

175 − 250 #12

250 − 400 #13

Plasma Arc Welding

100 − 125 #9

125 − 175 #10

175 − 225 #11

Note: The term “Heavy Metals” applies to steels, alloy steels, copper and its alloys, etc.

Refer to standard EN 379:2003 for comprehensive information regarding Table 1.

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Tweco Auto Darkening Welding Helmet Manuel d'utilisateur Page 18

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