welding midterm!! Flashcards
T/F PPE glasses/goggles must have Z87 or Z87+ marked on the frame
T/F Roll up sleeves and tuck in pant legs when wearing boots to prevent burns
T/F Any welding lens shade is permissible for all types of welding applications
T/F Infrared (IR) radiation cannot be felt
In most lab shops choosing shoes that are_______the ankle is the better choice
T/F Cylinders must be secured and in the upright position when storing and using
T/F Regulators can be in place when moving cylinders
Protect cylinders from heat, mechanical shock and_______
T/F Arc blow occurs when a magnetic field is developed while welding and causes the arc to move in an unpredictable manner
T/F The primary purpose of a shielding gas being present during the welding process is to protect the molten puddle from atmospheric contamination
T/F The amount of heat generated by GMAW arc is a function of both wire feed speed and the diameter of the wire
T/F A long arc length will decrease the arc voltage
T/F Using a weave pattern while placing a bead will increase the amount of heat in the weldment
Which polarity does not cause (magnetic) arc blow?
Argon can be used as a shielding gas for the following processes
GMAW, GTAW, FCAW
With SMAW and a given amperage, which polarity will provide the deepest penetration of the bead?
Which one of the following processes does a welder have some choice in the polarity selected for a given process electrode?
T/F An edge joint is formed with two overlapping materials. The edges create fillet welds
T/F Reinforcement refers to the depth of the penetration
T/F Restricted position means that the welder's positioning when welding pipe is resticed. Areas to be welded are difficult to reach
T/F When a weld symbol is both above and under the reference line, it means that welds are to be completed on both sides of the joint
T/F Pipe welding is comprised mostly of fillet welds
T/F A T-joint in the flat position is placed on the welding table so each plate is at a 45-degree angle to the table
T/F A double bevel groove weld has a bevel on both sides of only one plate
T/F A lap joint creates the geometry for fillet welds
T/F A 3F weld is a fillet weld completed in the horizontal position
The edges of a weld are the?
A_________joint is between two pieces of material that are aligned edge to edge in the same plane
For welding certification, a flat welding position groove is?
If the weld symbol is_______the reference line, then the weld is to be completed on the side that the arrow is pointing to
Which of the following identifies pipe positioned at a 45-degree angle?
Cutting tips are made out of which alloy?
Copper or chrome plated
What could happen if acetylene was used with the wrong tip?
The tip could overheat causing a backfire, backlash, or explosion
What is the most widely used fuel gas used for cutting?
T/F The distance from the tip of the electrode to the base material being welded is arc length
T/F The SMAW process only uses AC polarity
T/F Alternating current (AC) is the preferred type of current for welding for SMAW
T/F The stops and re-starts necessary with SMAW electrodes increases the risk of weld defects
The most basic type of welder is?
Which of the following is not part of the welding electrical circuit
None of the above
The transformer inside a welding power source converts high voltage, low amperage electricity into________electricity for welding
Low voltage, high amperage
To increase the penetration of a bead, you should select which welding polarity?
Which polarity is also referred to as reverse polarity?
Changes in the welding arc length will also change the following electrical characteristics?
T/F Metals are joined using the arc welding process when two pieces of metal are heated to their melting point and additional metal is added to the molten puddle. This molten mass cools and solidifies into one solid piece
T/F DCEN polarity is used when welding in the GMAW process
T/F The loss of shielding gas when welding outdoors can cause weld failures as a result of porosity, lack of fusion, and other undesirable discontinuities in the weld
T/F GMAW is suitable for use on just one few different metals
T/F GMAW exclusively uses inert shielding gas
A constant voltage system strives to keep which variables constant
How is current carried to the arc in the GMAW process
The electrode is energized by the contact tip that then carries the current to the arc