General Flashcards
What is the order of melting points from lowest to highest?
Aluminum (659c)
Stainless Steel (1449c)
Mild Steel (1510c)
Carbon (3704c)
What are the three metal transfer modes and what are the voltage settings?
Short Circuit (12-22) Globular (22-26) Spray Transfer (26-35)
Metal to metal wear is called what?
Gulling or seizing
What’s the most abrasive resistant metal.
Tungsten
What is the electrical stockpot for welding?
FCAW self shielded (3/4 - 3 3/4)
FCAW (3/8 - 3/4)
MCAW (3/8 - 3/4)
GMAW (1/4 - 3/8)
BG49A-3CG2
B - Tested with 27 Joules G - gas shielded 49A - tensile strength measured at 49000 kpa 3 - -30c Impact test C - CO2 or M for mixed G2 - Chemical composition
What are the two types of welding machines?
CC (SMAW/GTAW)
CV (Wire feed welding)
What’s the difference between a regulator and flowmeter?
Regulator controls pressure and flowmeter controls volume and flow.
E491T-9CH
E- electrode 49 - impact test of 49 kpa 1 - all position T - 9CH - characteristics CH - controlled hydrogen
R W C 2 - 20/30
R- indicates a welding rod
WC - tungsten (w) carbide (c)
2 - Chemical composition of tungsten granules
20/30- indicates mesh size of tungsten carbide
What’s an inert gas?
A gas that’s stable and non reactive
What causes stubbing?
Too much wire.
What effects penetration?
Gun inclination and electrode stickout
How is rate of flow measured in units?
L/min or cubic ft/hour
What’s the difference between using CO2 and Argon when welding mild steel?
CO2 is hotter and Argon has more penetration and a high crown
