AMS 261 Unit 3 – Study Guide, Practice Questions & Revision Notes

AMS 261 Unit 3 – Study Guide, Practice Questions & Revision Notes


•Fusion welding - ✔✔-Two compatible base metals, in close proximity, are heated and melted



-The three principal processes of fusion welding are: - ✔✔•Gas

•Electric arc

•Electric resistance



•Non-fusion welding - ✔✔•Two base metals are placed in close proximity to one another then
joined by adhesion.



Fusion Welding Classifications - ✔✔•Gas Welding

-Repairs

•Electric Arc Welding

-Manufacturing

-Repairs

•Electric Resistance Welding

-Manufacturing



Fusion Welding Processes - ✔✔•Gas Welding

-Oxyacetylene welding (OAW)

•Gas Tungsten Arc Welding

-GTAW (TIG)

•Gas Metal Arc Welding

-GMAW (MIG)

, •Gas Welding (OAW) - ✔✔-Oxygen is mixed with a fuel gas

•Acetylene (most common fuel gas)

•Hydrogen (formerly used to weld aluminum)

•Propane (inexpensive)



•Gas Welding (OAW) - ✔✔-The gas mixture is ignited to produce a flame temperature of about
5,6000 F to 6,3000 F



•Shielded Metal Arc Welding (SMAW) - ✔✔-Stick arc welding

-Used for welding heavy gage iron and steel

-Not suitable for aircraft repair or manufacturing



•The Basis for a Good Weld - ✔✔Know the different dimensions



•Gas Metal Arc Welding (MIG) - ✔✔•Excellent for high production

-Electrode is in wire form

-Wire automatically fed into weld

-Electricity melts base metal and wire to form weld filler

-Weld area shielded with inert gas



•Gas Tungsten Arc Welding (TIG) - ✔✔-Most common electric arc welding process used in
aviation

-Non-consumable tungsten electrode forms arc with base metal

-Arc provides heat (11,0000 F)

-Filler inserted by hand as in gas welding

Weld area shielded with inert gas