2026
Which defini on best describes the term, Dual Impulse:
-Feature or method of connec on which provides that, once the welding cycle has been
ini ated from the pilot switch, it must be opened and re-closed for each addi onal welding
cycle.
-A resistance welding process varia on in which spot, projec on, or upset welds are made with
a single impulse.
-A cylinder in which fluid force can be applied to the movable element in either direc on.
-A mode of spot welding using preheat, cool, and weld heat.
-A mode of spot welding using preheat, cool, and weld heat.
Which defini on best describes the term, Cylinder:
-Used on press and rocker arm type welders to provide addi onal electrode opening to allow
weld stroke adjustment or to place parts between electrodes and then return to weld stroke.
-A device for conver ng fluid energy into linear mo on. It usually consists of a movable element
such as a piston and piston rod, plunger, or ram opera ng within a cylinder bore.
-A cylinder in which fluid force can be applied to the movable element in either direc on.
-A cylinder in which the fluid force can be applied to the movable element in only one direc on.
-A device for conver ng fluid energy into linear mo on. It usually consists of a movable element
such as a piston and piston rod, plunger, or ram opera ng within a cylinder bore.
Which defini on best describes the term, Contactor:
-Mechanical or electronic switch used to control large currents.
-A cylinder in which the fluid force can be applied to the movable element in only one direc on.
-The current in the welding circuit during the making of a weld.
-The amount of effort (force) applied by electrodes to material being welded.
-Mechanical or electronic switch used to control large currents.
Which defini on best describes the term, Horn:
-A device for mechanically holding the electrode and conduc ng current.
-Essen ally cylindrical arm or extension of an arm of a resistance welding machine that
transmits the electrode force and conducts the welding current. Typically used to hold electrode
or electrode holder.
,-The lower arm, or suppor ng structure, in a resistance welding machine.
-Mechanical or electronic switch used to control large currents.
-Essen ally cylindrical arm or extension of an arm of a resistance welding machine that
transmits the electrode force and conducts the welding current. Typically used to hold electrode
or electrode holder.
Which defini on best describes the term, Followup:
-The area of the base metal melted as determined on the cross sec on of a weld.
-That part of a weld, including all or part of the nugget, that tears out in the destruc ve tes ng
of spot, seam, or projec on welded specimen.
-The ma ng surface of a member that is in contact with or in close proximity to another
member to which it is to be joined.
-The ability of an electrode to move at the same rate that the welding material becomes plas c.
-The ability of an electrode to move at the same rate that the welding material becomes plas c.
Which defini on best describes the term, Welding Current:
-The me interval during which welding current con nuously increases from the beginning of
welding current flow.
-Feature or method of connec on which provides that, once the welding cycle has been
ini ated from the pilot switch, it must be opened and re-closed for each addi onal welding
cycle.
-An impulse, or series of impulses, that occur prior to and are separated from the welding
current.
-The current in the welding circuit during the making of a weld.
-The current in the welding circuit during the making of a weld.
Which defini on best describes the term, Fusion Zone:
-The ma ng surface of a member that is in contact with or in close proximity to another
member to which it is to be joined.
-The area of the base metal melted as determined on the cross sec on of a weld.
-That part of a weld, including all or part of the nugget, that tears out in the destruc ve tes ng
of spot, seam, or projec on welded specimen.
-The diameter of a spot or projec on weld, or width of a seam weld measured in the plane of
faying surfaces.
-The area of the base metal melted as determined on the cross sec on of a weld.
Which defini on best describes the term, Air Lubricator:
-A cylinder in which fluid force can be applied to the movable element in either direc on.
, -Source of lubrica ng or air cylinder lubrica on.
-A device for conver ng fluid energy into linear mo on. It usually consists of a movable element
such as a piston and piston rod, plunger, or ram opera ng within a cylinder bore.
-The diameter of a spot or projec on weld, or width of a seam weld measured in the plane of
faying surfaces.
-Source of lubrica ng or air cylinder lubrica on.
Ques on #9:
Calculate current density (A/in.2 or kA/in.2) for the below applica on.
30 cycles squeeze, 10 cycles weld, 30 cycles hold
8,250-amps weld current
1,350-lb. electrode force
7/16-in. diameter, Class 2, Type "E" electrodes
1.275-ohms resistance in machine secondary
55,000
Ques on #10:
Consider the ideal current density for Ques on #9 is 168,024 A/in.2.
Calculate percent difference.
33% more than ideal
67% less than ideal
67% more than ideal
33% less than ideal
67% less than ideal
Interpret the calculated percent difference in Ques on #10: What is the likely result on the
weld?
-S ck weld/no weld
-Significant indenta on
-Significant expulsion
-Good weld
-S ck weld/no weld
Resistance welding electrodes are typically manufactured from _______________ based alloys
due to superior conduc ve proper es.
-Mild steel
-Stainless steel