Questions and Answers
What is the limitation of GTAW?
The ability to weld a variety of a(n)_________ of the TIG welding process.
material
What is a limitation of GTAW?
Is GTAW considered a clean process?
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Does GTAW have a concentrated arc?
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The torch for GTAW can be air or water cooled.
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GTAW is a first choice for high volume production welding.
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Does GTAW welding require clean base metals?
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Does GTAW create smoke or fumes?
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What is a significant advantage of the GTAW process?
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What does GTAW create with regard to sparks or spatter?
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Conventional GTAW welding power supplies can weld aluminum using single or three phase power.
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What type of power supply is required for GTAW?
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Duty cycle is measured over a ______ period.
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Is automotive anti-freeze the best for water cooled GTAW torch coolant systems?
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What must be cleaned from the weld joint?
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The most important task to complete before GTAW welding any material, is to ____________ the weld joint and surrounding area.
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What are the advantages of GTAW-P?
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What is the biggest difference between a conventional machine and an inverter for GTAW-P?
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What does GTAW-P represent?
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Helium or argon-helium mixtures are desirable on thick material and where high travel speeds are desired.
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What does shielding gas do?
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When the welding current, nozzle diameter, or electrode extension is increased, the flow rate should be _______________.
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Looking at the manufacturer's spec sheets is the easiest way to determine the settings for a specific aluminum filler metal.
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Looking at manufacturer sheets is the easiest way to determine what aluminum filler metal is needed for a known base metal.
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What should be considered when selecting filler metals?
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What uses a high voltage/low current/high hertz to start and stabilize the welding arc?
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What uses a low open circuit voltage to start the arc?
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High frequency is best controlled in a welding shop by _________ all electrically conductive materials in a _______ diameter sphere.
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What is an undesirable method to start the arc?
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Alternating current changes from electrode positive to electrode negative on a cyclic pattern.
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What is the primary reason to increase AC welding output frequency?
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Study Notes
GTAW Process Overview
- GTAW (Gas Tungsten Arc Welding) has a low deposition rate, classified as a limitation.
- This process allows welding of a variety of materials, presenting it as an advantage.
- Higher learning time associated with GTAW is noted as a limitation.
- Produces a clean welding environment, considered an advantage.
- GTAW features a concentrated arc, allowing precision welding, seen as advantageous.
Equipment and Operational Characteristics
- GTAW torch can be air or water-cooled, confirming its versatility (True).
- Not recommended for high-volumes of production welding, classified as a limitation (False).
- Brightness of the arc is a limitation, potentially causing visibility issues.
- Requires clean base metals for effective welding (True).
- Produces no smoke or fumes, enhancing safety and cleanliness, considered advantageous.
- Known for creating high-quality welds, another significant advantage.
- Generates no sparks or spatter, making it safer during operation.
Technical Requirements
- Conventional GTAW power supplies cannot weld aluminum using single-phase power (False).
- A constant current power supply is necessary for GTAW operations.
- Duty cycle is measured over a ten-minute period, essential for understanding equipment longevity.
- Automotive anti-freeze is not ideal for water-cooled GTAW torch coolant systems (False).
Preparation and Materials
- Essential to clean the weld joint and surrounding area from dirt, paint, rust, oil, corrosion, marking crayon, and grease before welding.
- GTAW-P (Pulsed Gas Tungsten Arc Welding) provides a constricted arc, reducing distortion, creating a narrow heat-affected zone, and lowering heat input.
Process Specifications
- The most significant difference between a conventional machine and an inverter for GTAW-P is the number of pulses per second.
- Shielding gases like helium or argon-helium mixtures enhance performance on thick materials and at high travel speeds (True).
- Shielding gases also assist in arc starting, protect weld puddles, control bead contour, stabilize arcs, and transfer heat from tungsten to base metal.
Operational Adjustments
- Increasing welding current, nozzle diameter, or electrode extension requires an increased flow rate.
- Manufacturer specifications sheets are crucial for determining optimal settings for aluminum filler metals (True).
- Selecting filler metals involves considering production efficiency, service conditions, welding positions, metal thickness, joint design, and base metal strength.
Arc Starting Methods
- High frequency operates on a high voltage, low current, and high hertz to start and stabilize the arc.
- Lift arc utilizes low open circuit voltage for arc initiation.
- Earth grounding of electrically conductive materials within a 100-foot sphere is vital for controlling high frequency.
- Scratch start is considered an undesirable arc-starting method.
Alternating Current Characteristics
- Alternating current (AC) shifts between electrode positive and negative patterns cyclically (True).
- Increased AC welding output frequency offers stable arcs and narrower bead shapes, improving welding precision.
Studying That Suits You
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Description
Test your knowledge on the advantages and limitations of the GTAW (Gas Tungsten Arc Welding) process with these flashcards. Each card features a statement requiring you to identify whether it is an advantage or a limitation of GTAW. Perfect for welding students and professionals alike.
