Equipment Setup & Operation Flashcards
7 cards from real SAW practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Equipment Setup & Operation flashcards as text
In a SAW system, what is the function of the voltage sensing feedback loop?
Answer: It signals the wire feeder to speed up or slow down to maintain the preset arc voltage
The voltage feedback loop measures actual arc voltage and commands the wire feeder to increase or decrease wire feed speed to restore the preset voltage, stabilizing arc length.
What is the purpose of a 'starting pad' or 'strike plate' placed at the beginning of a SAW weld?
Answer: To provide a solid surface for arc initiation without defects appearing in the production weld
A starting pad gives the arc a place to initiate and stabilize before the tractor reaches the production joint, keeping arc-start defects off the structural weld.
Which drive roll configuration is recommended for feeding solid SAW wire electrodes larger than 3.2 mm (1/8 in)?
Answer: U-groove drive rolls
U-groove drive rolls cradle large-diameter solid wire without deforming it, providing positive grip without the marking or deformation that V-groove or knurled rolls can cause.
A welding engineer specifies 'reverse polarity (DCEP)' for a SAW procedure. This choice is made primarily to achieve:
Answer: Maximum penetration into the base metal
DCEP directs more arc energy into the base metal, producing deeper penetration compared to DCEN or AC, which is why it is specified for full-penetration joint requirements.
When performing a visual check of flux condition before SAW, which observation would require the flux to be removed from service?
Answer: Flux contains clumped or fused particles indicating prior exposure to moisture or heat
Clumped or partially fused flux particles indicate the flux has been wetted or overheated, compromising its chemistry and shielding performance, requiring rejection.
Which SAW equipment component is responsible for maintaining constant travel speed along the weld joint?
Answer: The tractor drive motor with speed control
The tractor drive motor, governed by a calibrated speed control, moves the welding head along the joint at a constant, repeatable travel speed.
A SAW operator must weld a circumferential seam on a large-diameter vessel that exceeds the tractor's rated capacity. The correct approach is to:
Answer: Mount the head on a dedicated boom and column manipulator or use a seam welder rated for the diameter
Large circumferential seams require a boom-and-column manipulator or a dedicated seam welding station that keeps the torch aligned and maintains the correct welding position around the full circumference.