120103g GMAW FCAW & MCAW Groove welds on mild steel Flashcards
What are 2 advantages of using more than one process to complete a weld
- the cost of welding is reduced in many cases if the advantages of each process are applied to fabrication
- it increases production while maintaining high quality weld metal.
That is the root pass, where is it located on a Vee groove joint preparation
The root is the first penetrating bead. It is placed at the root of the joint
The electrode wire type is selected to match the
a) shielding gas
b) welders preference
c) thickness of parent metal
d) chemical & mechanical properties of the base metal
d) chemical & mechanical properties of the base metal
What is the recommended electrode angle on a groove weld?
a) 1/4 of the included angle
b) 1/2 of the included angle
c) 3/4 of the included angle
d) the same as the included angle
b) 1/2 of the included angle
What is the recommended inclination for the FCAW fill passes in the 1G position
a) forehand 10° - 30°
b) forehand 90°
c) backhand 0° - 10°
d) backhand 90°
c) backhand 0° - 10°
What is the recommended inclination for the MCAW fill/cap passes in the 2G position
a) forehand 0° - 10°
b) forehand 45°
c) backhand 45°
d) backhand 20° - 30°
a) forehand 0° - 10°
What mode of metal transfer is used with FCAW.
a) pulsed spray
b) spray
c) short circuit
d) globular
d) globular
What mode of metal transfer is used with MCAW in the 3G position.
a) pulsed spray
b) spray
c) short circuit
d) globular
a) pulsed spray
Name 4 factors that can influence flowmeter settings with GMAW and FCAW
Any of the following are correct
type and thickness of material
position of the weld
type of joint
diameter of wire
puddle size
air movement around the weld zone
gun inclination
nozzle to work distance
List 4 GMAW welding parameters
any of the following are correct
shielding gas type
shielding gas flow rate
wire speed setting
voltage setting
transfer mode
What type of equipment set up is recommended for high production welding using GMAW, FCAW, MCAW
a) CC & dual drive roll wire feeder
b) CV & dual drive roll wire feeder
c) CC, single drive roll wire feeder
d) CV, single drive roll wire feeder
b) CV & dual drive roll wire feeder
What type of interpass cleaning is normally required between the GMAW root pass and FCAW or MCAW deposited weld metal
a) grind to clean weld metal before proceeding
b) de-slag before proceeding
c) hand brush before proceeding
d) Interpass cleaning is not normally required
d) Interpass cleaning is not normally required
Explain why it is important to always start at the bottom and layer upwards when placing stringer bead fill and cap passes in the 2G position
Starting at the bottom and working your way up prevents the weld metal from rolling down and causing overlap or lack of fusion
Why would you use more than one welding process for one weld?
a) maximizes joint economy
b) faster
c)higher metal deposition
d) both a & c
d) both a & c
it’s about finding the most efficient and economical way to weld together different parts or components by selecting the right joint type, welding process, and techniques that minimize waste, reduce labor costs, and improve productivity.
If welding heavy wall pipe why would the welder use GMAW for the root then switch to FCAW or MCAW for the fill and cap passes.
GMAW has great control capabilities and is ideal for roots
FCAW & MCAW have high deposition rates the combination meets all codes and standards while being completed in much less time than only using one process.
