AM.II.A.K13
KnowledgeInert-gas welding practices and techniques.
From the FAA library
- Chapter 5: Aircraft Welding › Gas Welding Procedures & Techniques › Characteristics of a Good Weld
Correct Forming of a Weld The form of the weld metal has considerable bearing upon the strength and fatigue resistance of a joint. The strength of an improperly made weld is usually less than the strength for which the joint ... designed. Low-strength welds are generally the result of insufficient penetration; undercutting of the base metal at the toe of the weld; poor fusion of the weld metal with the base metal; trapped oxides, slag, or gas pockets…
- Chapter 5: Aircraft Welding › Gas Metal Arc Welding (GMAW)
Gas Metal Arc Welding (GMAW) Gas metal arc welding (GMAW) was formerly called metal inert gas (MIG) welding. It is an improvement over stick welding because an uncoated wire electrode is fed into and through the torch and an inert ... gas, such as argon, helium, or carbon dioxide, flows out around the wire to protect the puddle from oxygen. The power supply is connected to the torch and the work, and the arc produces the intense heat needed to melt…
- Chapter 5: Aircraft Welding › Arc Welding Procedures, Techniques, & Welding Safety Equipment › Overhead Position Welding
Figure 5-38. Typical lap joint fillet weld. When making fillet welds on overhead tee or lap joints, a short arc should be held, and there should be no weaving of the electrode. The arc motion should be controlled ... secure good penetration to the root of the weld and good fusion to the plates. If the molten metal becomes too fluid and tends to sag, the electrode should be whipped away quickly from the center ahead of the weld…