Working Area - Praxair MICROTIG 200 HF PULSE Manual De Instrucciones

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1.2.1 Working area

The use of arc welding implies a strict respect of safety conditions with regard to electric currents. It is necessary to check that no metal
piece accessible by the operators and to their assistants can come into direct contact with a phase conductor and the neutral of the network. In case
of uncertainty, this metal part will be connected to the earth with a conductor of at least equivalent section to the largest phase conductor.
Make sure that all metal pieces that the operator could touch with a non insulated part of his body (head, hands without gloves on, naked
arms, etc) is properly grounded with a conductor of at least equivalent section to the biggest supply cable of the ground clamp or welding torch. If
more than one metal ground is concerned, they need to be all interlinked in one, which must be grounded in the same conditions.
Unless very special care have been taken, do not proceed to any arc welding or cutting in conductive enclosures, whether it is a confined
space or the welding machine has to be left outside. Be even more prudent when welding in humid or not ventilated areas, and if the power source is
placed inside (Decree dated 14.12.1988, Art. 4).
1.2.3 Risks of fire and explosion
Welding can originate risks of fire or explosion. You have to pay attention to fire safety regulation
- Remove flammable or explosive materials from welding area;
- Always have sufficient fire fighting equipment;
- Fire can break out from sparks even several hours after the welding work has been finished.
1.3 INDIVIDUAL PROTECTION
1.3.1 Risks of external injuries
Arc rays produce very bright ultra violet and infrared beams. They will damage eyes and burn skin if the operator is not properly protected.
-The welder must be dressed and protected according to the constraints of his works impose to him.
-Operator must insulate himself from the work-pieces and the ground. Make sure that no metal piece, especially those connected to the network,
comes in electrical contact to the operator.
-The welder must always wear an individual insulating protection.
Protective equipments: gloves, aprons, safety shoes that offer the additional advantage to protect the operator against burns caused by hot
pieces, spatters, etc. Check the good state of this equipment and replace them before you are not protected any more.
- It is absolutely necessary to protect eyes against arc rays.
- Protect hair and face against sparks. The welding shield, with or without headset, must be always equipped with a proper filter according to the arc
welding current. In order to protect shaded filter from impacts and sparks, it is recommended to add a glass in front of the shield.
The helmet supplied with the equipment is provided with a protective filter. When you want to replace it, you must precise the reference
and number of opacity degree of the filter. Use the shade of lens as recommended in the following table (opacity graduation).
Protect others in the work area from arc rays by using protective booths, UV protective goggles, and if necessary, a welding shield with
appropriate protective filter on (NF S 77-104 – by A 1.5).
Welding process
Coated electrodes
MIG on heavy metals
MIG on light alloys
TIG on all metals
MAG
Air/Arc gouging
Plasma cutting
Depending on the conditions of use, the next highest or lowest category number may be used.
The expression "heavy metals" covers steels, alloyed steels, copper and its alloys.
The shaded areas represent applications where the welding processes are not normally used at present.
NOTE: Use a higher degree of filters if welding is performed in premises, which are not well lighted.
14
0,5
2,5
10
20
40
80
1
5
15
30
60
9
10
10
10
9
10
11
10
9
10
PRAXAIR MICROTIG 200 HF PULSE
Current Amps
125
175
225
275
100
150
200
250
300
11
12
11
12
11
12
13
12
13
14
11
12
13
10
11
12
13
11
12
13
350
450
400
500
13
14
13
14
14
15
14
15
14
15
.

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