Questions and Answers
In order to maintain production it is acceptable to operate welding equipment beyond its rated capacity.
False
Oxygen cylinders should never be stored with flammable gases.
True
Gas cylinders must be chained or secured at all times.
True
Skin contact with liquid oxygen can cause frostbite.
Signup and view all the answers
Safety glasses are not required when welding with the helmet down.
Signup and view all the answers
A fully charged oxygen cylinder contains approximately 225 psi at 70 degrees Fahrenheit.
Signup and view all the answers
A butane or propane cigarette lighter is safe around welding equipment.
Signup and view all the answers
Long hair, loose fitting clothes, and ties are personal safety hazards around rotating equipment.
Signup and view all the answers
Because of the low amount of UV light, it is NOT necessary to use shaded lenses when oxy-fuel cutting.
Signup and view all the answers
When welding, ventilation should be placed as close to the fume source as practical.
Signup and view all the answers
Areas that have less than _______ cubic ft. per welder, or that have ceilings less than 16 ft. require __________.
Signup and view all the answers
What is the only acceptable method for lighting oxy-fuel torches?
Signup and view all the answers
What form is used to report hazardous information?
Signup and view all the answers
The selection of a correct lens shade number depends on __________.
Signup and view all the answers
What burn causes the skin to blister?
Signup and view all the answers
NEVER operate arc welding equipment while __________.
Signup and view all the answers
NEVER cut or weld directly against __________.
Signup and view all the answers
NEVER use __________ on gas cylinders, regulators, connections, and hoses.
Signup and view all the answers
NEVER enter a welding shop without wearing __________.
Signup and view all the answers
What is a burn to the eye caused by exposure to UV light from the welding arc called?
Signup and view all the answers
Fuel gas hoses are usually colored __________.
Signup and view all the answers
Vaporized metals such as zinc, cadmium, lead, chromium, beryllium are considered __________.
Signup and view all the answers
Maximum safe working pressure for Acetylene is __________.
Signup and view all the answers
What are the initials of the federal organization created to ensure safe and sanitary working conditions for employees?
Signup and view all the answers
What type of fire extinguisher should be used on electrical fires?
Signup and view all the answers
What are potential hazards relating to welding?
Signup and view all the answers
When using a fire extinguisher to extinguish a fire, it should be pointed at __________.
Signup and view all the answers
When not in use, an electrode holder, GTAW torch or MIG gun should NOT be placed in contact with a grounded metal surface.
Signup and view all the answers
Acetylene cylinders should NEVER be operated while laying on their side because acetone could be drawn into the valve, regulator, and hoses.
Signup and view all the answers
One should NEVER touch an electrode to a metal surface other than the workpiece because those surfaces may become electrically live.
Signup and view all the answers
ANSI Z49.1 allows oxygen to be used as a substitute for compressed air when necessary.
Signup and view all the answers
Burns are some of the most common and painful injuries in a welding shop.
Signup and view all the answers
Fuel gas fittings are equipped with left hand threads.
Signup and view all the answers
Gas supply is NOT a requirement for the SMAW process.
Signup and view all the answers
What are correct statements about an E7018 electrode?
Signup and view all the answers
The distance from the molten tip of the SMAW electrode to the surface of the molten weld pool should be __________.
Signup and view all the answers
Electrodes that are suitable to use in all positions include?
Signup and view all the answers
Which electrode would you select to produce a weld with shallow penetration?
Signup and view all the answers
An engine-driven generator without a rectifier produces what form of welding current?
Signup and view all the answers
What group of electrodes is considered low hydrogen type?
Signup and view all the answers
"Arc blow" is caused by __________.
Signup and view all the answers
What does the term 'Duty Cycle' indicate?
Signup and view all the answers
When the welding machine is set to DECP, current flows __________.
Signup and view all the answers
What is the largest cable size?
Signup and view all the answers
What ability do rectifiers have?
Signup and view all the answers
In North America, alternating current changes direction __________.
Signup and view all the answers
In order to reduce waste and control cost, you should weld until the electrode is __________.
Signup and view all the answers
The last digit in the electrode classification E7018 indicates __________.
Signup and view all the answers
The E7024 electrode can be used in __________.
Signup and view all the answers
The electrode classification that indicates a deep penetrating electrode that can be used with alternating current is __________.
Signup and view all the answers
Back stepping at the end of a weld made with the SMAW process helps to prevent crater cracking.
Signup and view all the answers
The first two digits of the electrode classification indicate the __________.
Signup and view all the answers
An E6010 deep penetrating electrode belongs to __________.
Signup and view all the answers
SMAW equipment is portable because the welding machines can be powered with gasoline or diesel engines.
Signup and view all the answers
Excessive spatter and undercutting of weld joints can be caused by current values being set too high.
Signup and view all the answers
The E6010 Electrode is run mostly on DCEN.
Signup and view all the answers
A number 1 in the next to last digit of the electrode classification for SMAW electrodes indicates that an electrode can be used in the flat position and on horizontal flat welds only.
Signup and view all the answers
A number 2 in the next to last digit of the electrode classification on an SMAW electrode indicates the electrode may be used in all welding positions.
Signup and view all the answers
With direct current electrode positive, the work piece is positive.
Signup and view all the answers
In GMAW, the shielding for the molten metal is through the use of __________.
Signup and view all the answers
GMAW is the abbreviation for __________.
Signup and view all the answers
In GMAW, insufficient gas flow can cause __________.
Signup and view all the answers
A worn contact tube results in __________.
Signup and view all the answers
The benefit of copper coated electrode wires is?
Signup and view all the answers
What type of power source is used for GMAW?
Signup and view all the answers
In GMAW, which type of metal transfer is restricted to flat position and horizontal fillet welds?
Signup and view all the answers
What type of electrode wire is used with GMAW?
Signup and view all the answers
In GMAW, the amperage is controlled by adjusting the __________.
Signup and view all the answers
In GMAW, the electrode extension is defined as the distance from the __________.
Signup and view all the answers
Which AWS electrode classification is correct for GMAW wire?
Signup and view all the answers
Which of the following is considered an advantage of the GMAW process?
Signup and view all the answers
Electrode current is transferred to the electrode through the __________.
Signup and view all the answers
What shielding gas or gas mixture will not produce spray transfer?
Signup and view all the answers
The contact tube should be __________.
Signup and view all the answers
What does the 70 indicate in ER70S-3 stand for?
Signup and view all the answers
Excessive amounts of weld spatter at the nozzle may cause __________.
Signup and view all the answers
Which of the following is not recommended when welding with short-circuiting transfer?
Signup and view all the answers
Which is not an advantage of GMAW?
Signup and view all the answers
The transfer mode that uses low currents, low voltage, and small diameter electrode wire to weld in all positions is __________.
Signup and view all the answers
What positions and types of welds can be welded using spray transfer on carbon steel?
Signup and view all the answers
Which shielding gas or gas mixture is most often used for welding carbon steel with the short-circuiting transfer mode?
Signup and view all the answers
Which one of the gases below is inert?
Signup and view all the answers
A constant voltage power supply is the most common type used for GMAW.
Signup and view all the answers
The rate at which the arc moves along the weld joint is called the wire feed speed.
Signup and view all the answers
A minimum of 80% Argon is required to achieve spray transfer.
Signup and view all the answers
In the electrode classification ER70S-3, the "S" stands for Short-Circuiting transfer.
Signup and view all the answers
In the AWS electrode classification E71T-1, the digit after the dash designates __________.
Signup and view all the answers
A flux-cored electrode that protects the weld zone from contaminants with fluxing elements released from the core of the wire itself is called __________.
Signup and view all the answers
Which electrode classification identifies a filler metal that can be used in the overhead position?
Signup and view all the answers
Which of the following is not essential for FCAW-S?
Signup and view all the answers
In the FCAW electrode classification E71T-1, the letter T indicates __________.
Signup and view all the answers
A flux-cored electrode used with an external shielding gas is not self-shielded.
Signup and view all the answers
When examining a spool of filler metal to determine if it is designed for flux-cored welding, one should look for __________.
Signup and view all the answers
The process produces slag-free welds.
Signup and view all the answers
What type of drive rolls are used with the FCAW electrode wire?
Signup and view all the answers
Which of the following is not an advantage of FCAW-G?
Signup and view all the answers
Of the two basic FCAW processes, one is self-shielding, and one uses __________.
Signup and view all the answers
FCAW-G indicates what type of shielding?
Signup and view all the answers
Study Notes
Welding Safety and Practices
- Operating welding equipment beyond its rated capacity is not acceptable to maintain production.
- Oxygen cylinders must be stored separately from flammable gases to prevent accidents.
- Gas cylinders should always be secured or chained to prevent tipping.
- Skin contact with liquid oxygen can result in frostbite; proper handling is essential.
- Safety glasses are required even when welding with the helmet down to protect eyes from potential hazards.
Equipment and Handling Guidelines
- A fully charged oxygen cylinder does not contain approximately 225 psi at 70°F; this is a common misconception.
- Butane or propane lighters should never be used around welding equipment due to fire hazards.
- Loose clothing, long hair, and accessories are safety hazards around rotating equipment.
- Ventilation during welding should be as close to the fume source as possible to improve air quality.
Fire and Hazard Management
- A hot work permit is necessary for any work that poses a fire hazard.
- Confined spaces must be large enough for an individual to enter and perform tasks safely.
- The maximum safe working pressure for acetylene is 15 psi, crucial for safe handling and operation.
Welding Techniques and Equipment
- Different types of electrodes (E6010, E6011, E7018) have varied applications, with E7018 suitable for all positions.
- Selecting the correct lens shade for welding is based on the amount of current being used.
- SMAW (Shielded Metal Arc Welding) is portable and can be powered by gasoline or diesel engines.
GMAW (Gas Metal Arc Welding) Insights
- GMAW uses inert and reactive gases for shielding the molten metal.
- Excessive weld spatter can occur due to poor shielding; proper gas flow is essential.
- Copper coated electrode wires lead to better arc starts and increased contact tip life.
Understanding Electrode Classifications
- In AWS classifications, the first two digits indicate the minimum tensile strength of the weld.
- A "T" in an electrode classification signifies it's designed for flux-cored welding.
- Electrode classifications also specify their suitability for different welding positions.
Common Welding Hazards
- Arc blow is caused by magnetic forces associated with direct current.
- Burns, particularly flash burns from UV exposure, are common injuries in welding environments.
- Flameless operations around acetylene cylinders are crucial to prevent drawing acetone into regulators.
Best Practices and Tips
- Always use a striker for igniting oxyfuel torches; never directly light them.
- Keep welding equipment away from grounded metal surfaces when not in use.
- Ensure that the contact tube size matches the wire diameter for optimal functionality.
General Welding Knowledge
- Understanding the shielding gas composition is critical; for example, 75% Argon and 25% CO2 is typical for carbon steel welding.
- The duty cycle indicates how long a machine can operate at its rated output in a given time, important for maintaining equipment longevity.
- Knowing the difference between self-shielded and externally shielded flux-cored wires is essential for selecting the proper electrode type for the task at hand.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge of welding safety and best practices with these flashcards. Review true or false statements related to the operation of welding equipment and the handling of gas cylinders. Perfect for students and professionals in the welding field.
