This document discusses safety precautions for gas metal arc welding. It recommends using proper eye and ear protection like a welding helmet with the correct lens shade and hearing protectors. Proper attire like welding gloves and protective clothing should be worn. Hazards from electrical shock, fumes and gases, arc radiation, fire or explosions, and compressed gas cylinders are described and safety measures to mitigate these risks are provided.
An introduction to various welding processes, suitable for all welding students and welding professionals like welder, supervisor, inspector, engineer.
this ppt pdf beneficial for 1st year engineering student who studying workshop technology. in this pdf types of joining, gas welding, arc welding, spot welding, tig welding, mig welding, soldering brazing and different welding defect has been discussed.
An introduction to various welding processes, suitable for all welding students and welding professionals like welder, supervisor, inspector, engineer.
this ppt pdf beneficial for 1st year engineering student who studying workshop technology. in this pdf types of joining, gas welding, arc welding, spot welding, tig welding, mig welding, soldering brazing and different welding defect has been discussed.
Welding process
Arc Welding
Resistance Welding
Oxy fuel Gas Welding
Other Fusion Welding Processes
Solid State Welding
Weld Quality
Weld ability
Design Considerations in Welding
Image result for welding
Welding is a fabrication or sculptural process that joins materials, usually metals or thermoplastics, by causing fusion, which is distinct from lower temperature metal-joining techniques such as brazing and soldering, which do not melt the base metal.
Welding Defects
Eurotech Now inteducing Welding Defects. Welding Defect is any type of flaw in the object which requires welding. Seven type of Welding Defect
Seven type of Common weld defects include:
1. Lack of fusion
2. Lack of penetration or excess penetration
3. Porosity
4. Inclusions
5. Cracking
6. Undercut
7. Lamellar tearing
Any of these defects are potentially disastrous as they can all give rise to high stress intensities which may result in sudden unexpected failure below the design load or in the case of cyclic loading, failure after fewer load cycles than predicted.
Welding Processes
Two Categories of Welding Processes
Arc Welding
Resistance Welding
Oxy-fuel Gas Welding
Other Fusion Welding Processes
Solid State Welding
Shielded Metal Arc Welding
Gas Metal Arc Welding
Flux‑Cored Arc Welding
Electro gas Welding
Submerged Arc Welding
Gas Tungsten Arc Welding (GTAW) or TIG
Resistant Welding
Brazing and Soldering
Welding process
Arc Welding
Resistance Welding
Oxy fuel Gas Welding
Other Fusion Welding Processes
Solid State Welding
Weld Quality
Weld ability
Design Considerations in Welding
Image result for welding
Welding is a fabrication or sculptural process that joins materials, usually metals or thermoplastics, by causing fusion, which is distinct from lower temperature metal-joining techniques such as brazing and soldering, which do not melt the base metal.
Welding Defects
Eurotech Now inteducing Welding Defects. Welding Defect is any type of flaw in the object which requires welding. Seven type of Welding Defect
Seven type of Common weld defects include:
1. Lack of fusion
2. Lack of penetration or excess penetration
3. Porosity
4. Inclusions
5. Cracking
6. Undercut
7. Lamellar tearing
Any of these defects are potentially disastrous as they can all give rise to high stress intensities which may result in sudden unexpected failure below the design load or in the case of cyclic loading, failure after fewer load cycles than predicted.
Welding Processes
Two Categories of Welding Processes
Arc Welding
Resistance Welding
Oxy-fuel Gas Welding
Other Fusion Welding Processes
Solid State Welding
Shielded Metal Arc Welding
Gas Metal Arc Welding
Flux‑Cored Arc Welding
Electro gas Welding
Submerged Arc Welding
Gas Tungsten Arc Welding (GTAW) or TIG
Resistant Welding
Brazing and Soldering
Welding is the most economical and efficient way to join metals permanently. It is the only way of joining two or more pieces of metal to make them act as a single piece. Welding is vital to our economy. Welding ranks high among industrial processes and involves more sciences and variables than those involved in any other industrial process. Welding is the joining of metals. What welding does is join metals or other materials at their molecular level with the technology we have at the moment.
More visit:- http://www.tradusway.com/electrical/welding.html/?p=2
Safe practices while Welding, Gas cutting and machining activitiesMohammad Kashif
This presentation contains safety practices to be followed by technicians while working on a job. The slides do not contain engineering details of the equipment or ISO , NFCA standards
5. LENS SHADES SELECTION FOR GAS METAL ARC WELDING
Minimum Suggested *
Electrode Size Arc Protective Shade No.
Operation in. (mm) Current (A) Shade (Comfort)
GMAW Less than 60 7 10
Not Specified
60-160 8 12
Per
160-250 10 12
AWS / ANSI
250-550 11 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, which gives sufficient view of the weld zone without going below the minimum.
AWS/ANSI Lens Shade Numbers
8. Electrical Hazards
• High Voltage Can Kill
– Do Not Operate With Covers Removed
– Disconnect Input Power Before Servicing
– Do Not Touch Electrically Live Parts
• Electrical Shock Can Kill
– Do Not Touch Electrode With Skin or Wet Clothing
– Insulate Yourself From Work and Ground
9. Fumes & Gases
• Welding May Produce Hazardous
Fumes And Gases
• Shielding Gases Can Displace Air and May Cause
Injury or Death
• Use Ventilation To Keep Air Breathing Zone Clear
• Do Not Weld Near Chlorinated Hydrocarbons
10. Arc Radiation
• Electric Arc Welding Rays Can
Burn Eyes and Skin
• Always Use a Helmet When Arc Welding
• Select Appropriate Filter Lens
• Wear Appropriate Clothing
• Provide Non-Flammable Shielding to Protect Others
11. Fire or Explosion
• Remove Flammable Materials From
The Welding Area
• Keep a Fire Extinguisher in the Welding Area
• Wear Fire Retardant Clothing
• Do Not Weld on Containers Which Have Held
Combustible Materials
12. General Work Area Hazards
• Keep Power Source Cables, Welding
Materials and Tools Neatly Organized
• Connect Work Cable as Close as Possible to
the Weld Area
• Do Not Allow Alternative Circuits Through
Scaffold Cables, Hoist Chains, or Ground Leads
• Use Only Properly Grounded Equipment
• Always Disconnect Power to Arc Welding
Equipment Before Servicing
13. Compressed Gas Hazards
• Cylinders may Explode if Damaged
• Keep Cylinders Upright and Chained to
Support
• Keep Cylinder Free from Sparks and Out
of the Spark Zone
• Never Allow Welding Electrode to Touch
the Cylinder
