ma - welding, soldering, brazing

8/14/2019 MA - Welding, Soldering, Brazing

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Welding, Soldering, BrazingWelding, Soldering, Brazing

Max Akhterov

Zettl Group Safety Talk

11/07/06

http://upload.wikimedia.org/wikipedia/en/a/a5/SMAW.welding.navy.ncs.jpg



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Welding

Welding is a materials joining process which produces coalescence of materials by heating them to suitable temperatures with or without the application of pressure or by the application of

pressure alone, and with or without the use of filler material.The American Welding Society

AWS distinguishes the welding processes according to:

Mode of energy transfer

Influence of capillary attraction in effecting distribution of filler metal in the joint

Groups of welding processes:

• Arc welding

• Brazing

• Oxyfuel Gas Welding• Resistance Welding

• Solid State Welding

• Soldering

• Other



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Hazards

2. Electric Shock

3. Radiation

5. Fire and Burns

1. Fumes and Gases

4. Noise



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Fumes and Gases

Fumes are solid particles which originate from welding consumables, the base

metal, and any coatings present on the base metal.

Possible effects of over-exposure (magnesium, copper, zinc, lead, chromium, etc.):

• Irritation of eyes, skin, respiratory system

• Symptoms: nausea, headaches, dizziness, metal fume fever

• manganese overexposure can affect the central nervous system

resulting in impaired speech and movement

• In confined spaces the gases might displace breathing air and cause asphyxiation

How to avoid:• Do not breathe the fumes

• Use respiratory protection

• Use enough ventilation or exhaust

• Be sure the breathing air is safe



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Electric Shock

The voltage used in welding: 120 – 575 V

The current used in welding: 150 – 500 A

Possible effects of electric shock:

• Spasms

• Burns

• Muscle paralysis

• Death

How to avoid:

• Properly install and ground the equipment

• Wear dry, hole-free, insulating gloves and

protective clothing

• Insulate yourself from the work piece

and ground



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Radiation

Radiation is electromagnetic energy given off by the arc or flame that can injure eyes

and burn skin. Operator does not see ultraviolet and infrared radiation. Radiation is oftensilent and undetected, yet injury occurs. Two type of radiation: Ionizing, Nonionizing.

Possible effects of radiation:

• Skin burns

• Eye damage• Skin cancer

• Symptoms: “sand in the eyes”, feeling of pressure in the eyes, tearing, photophobia

How to avoid:

• Use welding helmet with correct shade of filter plate

• Protect skin with adequate gloves and clothing

• Be aware of reflections from welding arcs



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Noise

In welding noise may result from the process, the power source, or other equipment.Excessive noise is a known health hazard.

Possible effects of noise:

• Loss of hearing that may be either full or partial and either

temporary or permanent

• Hearing loss may be a temporary threshold shift from which

the ears may recover if removed from the noise source

How to avoid:

• Shield the source where practical

• Reduce the intensity of the source

• Use earmuffs



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Fire and Burns

Welding processes produce molten metal, sparks, slag, and hot work surfaces. These cancause fire or burns.

How to avoid fire:

• Remove combustible materials for a minimum radius of 10.7 meters around the work area

• Cover or block all openings, such as doorways, windows, cracks, or other openings withfire resistant material

• Do not weld on or cut material having a combustible coating or internal structure

How to avoid burns:

• Wear dry, hole-free insulating gloves

• Wear oil-free protective garments such as leather gloves, heavy shirt, cuffless pants,

high shoes, and a cap

• Use approved helmets and safety goggles



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Personal Protective EquipmentRespiratory protection



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Personal Protective EquipmentEye safety

Safety eyewear should always be worn

under the welding helmet to protect

against flying debris when the helmet is

raised to inspect work and when engaged

in other welding activities, e.g. grinding,

hammering.



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274 Le Conte Hall

Oxy-fuel welding and cutting safety

(flame temperature 2000 C):

• Before using an oxyhydrogen setup, ensure that

flammable materials such as grease, oil, paint,

sawdust, etc are cleared from the area

• Use enough ventilation or exhaust

• Shaded goggles with enclosed sides to protectyour eyes from glare sparks and splatter

• Wear leather gloves to protect your hands from

burns. Clothes and shoes/boots appropriate for

welding.



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Soldering

Soldering safety (about 400°C):

• Work only in well-ventilate areas

• Use soldering support

• Avoid touching the mains flex

with the tip of

the iron

• Always return the soldering iron to

its stand when not in use

• Wash your hands after using

solder



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Resources

• EHS 0243 - Soldering Awareness Training

• The American Welding Society:

http://aws.org/w/s/technical/facts/index.html

• Welding Guideline:

www.gov.mb.ca/labour/safety/pdf/welding_guide.pdf


http://www.gov.mb.ca/labour/safety/pdf/welding_guide.pdf

http://www.gov.mb.ca/labour/safety/pdf/welding_guide.pdf




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