GMAW: chapter 11 review questions -7th
Edition by Larry Jefuss
- What items make up the basic semiautomatic welding system?
Correct Answer:
The basic semiautomatic welding system includes an automatic machine guide that can be controlled by a set program and the whole set of welding machine components. This means the system consists not only of the welding power source but also the wire feeder, the welding gun, and a programmable guide that controls the welding operation to ensure consistent and efficient welding.
- What must be done to the shielding gas cylinder before the cap is removed?
Correct Answer:
Before removing the cap, you must make sure that the cylinder is chained securely. This is crucial to prevent the heavy gas cylinder from tipping over or falling, which can cause dangerous accidents or damage. Securing the cylinder protects both the operator and the equipment.
- Why is the shielding gas valve "cracked" before the flowmeter regulator is
attached?
Correct Answer:
The valve is "cracked" (opened briefly) to blow out any dirt or debris inside the valve. This prevents contaminants from entering the flowmeter or the welding torch, which could block gas flow or damage equipment.
- What causes the electrode to bird-nest?
Correct Answer:
Bird-nesting occurs when the feed roller pushes the wire into a tangled ball because the wire cannot pass smoothly through the outside feed conduit. This happens if the wire is caught, kinked, or if the conduit is damaged or misaligned, causing the wire to coil up improperly. 1 / 2
- Why must all fittings and connections be tight?
Correct Answer:
All fittings and connections must be tight to prevent gas or electrical leakage. Leaks in the shielding gas line can reduce gas coverage, leading to poor weld quality and increased spatter.Electrical leaks can cause unsafe operating conditions.
- What can be done to determine the location of a problem that stops the wire
from being successfully fed through the conduit?
Correct Answer:
You can mark the wire with tape and then remove it from the gun. By seeing where the tape mark stops, you can identify the exact point where the wire feed is being obstructed, allowing you to troubleshoot the issue more effectively.
- What is the advantage of using feed roller pressure that is as light as possible?
Correct Answer:
Using light feed roller pressure ensures that the wire feed will stop if something like clothing or hoses get caught in the reel. This prevents wire damage and potential injury or equipment malfunction by avoiding excessive force on the wire.
- Why should the feed roller drag prevent the spool from coasting to a stop
when feeding stops?
Correct Answer:
Because if the spool continues to coast, the wire can be snagged easily, causing tangles or damage to the wire feed system. Drag on the feed roller helps maintain control over wire movement and prevents uncontrolled wire feed.
- Why must you wind the wire tightly into a ball or cut it into short lengths
before discarding it in the proper waste container?
Correct Answer:
Loose wires present a hazard to safe movement around the machine because they can cause
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