When depositing overlapping welds on a pad of beads the overlap should be about?
When overlapping stringer beads, use a work angle of 10 to 15 degrees toward the first stringer bead to obtain, proper tie-in. the tapping method.
Why must the weld beads in padding be overlapped?
Overlapping beads are made by depositing connective weld beads parallel to one another. The parallel beads overlap, forming a flat surface. Overlapping beads are used to build up a surface and to make multi-pass welds.
How much should stringer beads overlap on a filler pass?
Filler passes are made with Stringer beads or weave beads. They should overlap enough so that the finished bead is smooth. Stringer beads usually overlap about 50% and weave beads overlap approximately 25%. Each weld bead must be cleaned before the next bead it started.
What is stringer bead in welding?
The stringer bead welding technique is one in which the weld beads are deposited in a straight line. When using the weave bead technique, the weld beads are deposited in a zigzag formation. The forward weld travel speed of the stringer bead method is faster than that of the weave bead method.
When hoisting heavy objects that tend to spin or swing always use?
|when lifting heavy objects objects that tend to spin or swing always remember to use||tag lines|
|the primary current for a welding machine can be 120v or 240v single phase or _________ three phase||480v|
|the size of an arc welding machine is determined by its rated amperage and||duty cycle|
What four factors must an arc welder control in order to produce an acceptable bead?
The movement or weaving of the welding electrode can control the following characteristics of the weld bead: penetration, buildup, width, porosity, undercut, overlap, and slag inclusions.
How can the weld bead be cleaned up?
Often, 70 percent isopropyl alcohol can be used for cleaning both filler rods and base materials before welding. Look for tools designed for use with stainless steel, such as stainless steel brushes or grinding wheels, to avoid introducing contamination into the weld during interpass cleaning.
When multiple beads are used it is not always necessary to remove slag between beads?
|T/F The flat position is the best position in which to weld any joint.||T|
|T/F When multiple beads are used, it is not always necessary to remove slag between beads||F|
|T/F The reversal of current in an AC circuit virtually eliminates arc blow||T|