Answered

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When setting up to make a GTA weld on low carbon steel, the tungsten should be

A. pointed, DCEN
B. set 1 in. (25 mm) out of the nozzle, DCEN
C. even with the nozzle, DCEP
D. rounded, AC

and the welding machine set

Sagot :

GinnyAnswer
When setting up to make a Gas Tungsten Arc (GTA) weld on low carbon steel, the following steps should be considered:

1. Preparation of the Tungsten Electrode: Low carbon steel requires specific electrode preparation to ensure proper weld quality.
- Shape: For low carbon steel welding, it is important to use a tungsten electrode that is pointed. A pointed electrode provides a concentrated and stable arc that is effective for the required precision in low carbon steel welding.

2. Polarity: The polarity setting on the welding machine is also crucial:
- DCEN (Direct Current Electrode Negative): For low carbon steel, DCEN is typically used. This means the electrode is connected to the negative terminal, allowing deeper penetration with a stable arc and minimal electrode overheating.

Therefore, the correct setup involves using a pointed tungsten electrode and setting the welding machine to DCEN.

Given these considerations, the correct answer to the question is:
a. pointed, DCEN
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