مستكشف
07-12-2004, 11:46 AM
لسلام عليكم ورحمة الله وبركاته
والحمد لله وكفي والصلاة والسلام على من اصطفي؛وبعد
أحببت أن أقدم اليوم موضوع جديد في تقنية اللحام (welding technology) ألا وهو (metal inert gas shelding welding)
GTAW WeldingGas Tungsten Arc Welding (GTAW) is frequently referred to as TIG welding. TIG welding is a commonly used high quality welding process. TIG welding has become a popular choice of welding processes when high quality, precision welding is required In TIG welding an arc is formed between a nonconsumable tungsten electrode and the metal being welded. Gas is fed through the torch to shield the electrode and molten weld pool. If filler wire is used, it is added to the weld pool separately.
http://www.weldingengineer.com/Tig%20B%2005.GIF
TIG Welding Benefits
Superior quality welds
Welds can be made with or without filler metal
(Precise control of welding variables (heat
Free of spatter
Low distortion
http://www.weldingengineer.com/images/automatic%20welding%2002.jpg
Shielding Gases
Argon
Argon + Hydrogen
Argon/Helium
Helium is generally added to increase heat input (increase welding speed or weldpenetration). Hydrogen will result in cleaner looking welds and also increase heatinput, however, Hydrogen may promote porosity or hydrogen cracking.
http://www.weldingengineer.com/images/tig%20welder%2003.jpg
GTAW Welding Limitations
Requires greater welder dexterity than MIG or stick welding -
Lower deposition rates -
More costly for welding thick sections -
Common GTAW Welding Concerns
common welding problems and discontinuities such as those listed below
Undercutting -
Tungsten inclusions -
Porosity-
Weld metal cracks -
Heat affected zone cracks -
TIG Welding Problems
Erratic arc -
Excessive electrode consumption-
Oxidized weld deposit -
Arc wandering -
Porosity-
Difficult arc starting -
http://www.weldingengineer.com/images/tig%20weld%2003.jpg
والحمد لله وكفي والصلاة والسلام على من اصطفي؛وبعد
أحببت أن أقدم اليوم موضوع جديد في تقنية اللحام (welding technology) ألا وهو (metal inert gas shelding welding)
GTAW WeldingGas Tungsten Arc Welding (GTAW) is frequently referred to as TIG welding. TIG welding is a commonly used high quality welding process. TIG welding has become a popular choice of welding processes when high quality, precision welding is required In TIG welding an arc is formed between a nonconsumable tungsten electrode and the metal being welded. Gas is fed through the torch to shield the electrode and molten weld pool. If filler wire is used, it is added to the weld pool separately.
http://www.weldingengineer.com/Tig%20B%2005.GIF
TIG Welding Benefits
Superior quality welds
Welds can be made with or without filler metal
(Precise control of welding variables (heat
Free of spatter
Low distortion
http://www.weldingengineer.com/images/automatic%20welding%2002.jpg
Shielding Gases
Argon
Argon + Hydrogen
Argon/Helium
Helium is generally added to increase heat input (increase welding speed or weldpenetration). Hydrogen will result in cleaner looking welds and also increase heatinput, however, Hydrogen may promote porosity or hydrogen cracking.
http://www.weldingengineer.com/images/tig%20welder%2003.jpg
GTAW Welding Limitations
Requires greater welder dexterity than MIG or stick welding -
Lower deposition rates -
More costly for welding thick sections -
Common GTAW Welding Concerns
common welding problems and discontinuities such as those listed below
Undercutting -
Tungsten inclusions -
Porosity-
Weld metal cracks -
Heat affected zone cracks -
TIG Welding Problems
Erratic arc -
Excessive electrode consumption-
Oxidized weld deposit -
Arc wandering -
Porosity-
Difficult arc starting -
http://www.weldingengineer.com/images/tig%20weld%2003.jpg