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PPT : Welding, Soldering, Brazing

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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

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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PPT : Welding, Soldering, Brazing Category : Welding
Source : www.physics.berkeley.edu
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Language : English
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