exothermic welding Flashcards
When a fault occurs in a substation or on one of the circuits feeding in or out of the substation, ?
30 seconds
After a connection is made with exothermic welding, the color of the good connection should be ? to bronze in color.
gold
If a finished exothermic connector has pinholes, a probe ? in diameter can be used to check the depth of any pinholes in the connector.
1/32”
The average temperature generated by exothermic welding is ? , which makes wearing heat-resistant gloves a requirement.
4000 degrees
The project management must have a protection program in place that includes training in selection, fitting, and cleaning of ? protection equipment when PPE of this type is used.
respiration
Some graphite molds used for exothermic welding are very robust and can be used for up to ? connections, but a visual inspection should be made after every use and the mold replaced as needed.
75
Which of the following statements is not an advantage of the exothermic type of connection?
the installer requires no field training
An inspection of a completed Cadweld connection reveals that the weld cavity was not filled over the cable strands. The presence of “fins” are evident. The probable cause of this rejected connection is ?
that the mold was not closed tightly
The inspection of a completed exothermic weld reveals a heavy carbon coating on the cables and connection. The cause of this rejected connection is ?
the presence of oil or grease on the cable
When making an exothermic connection to a galvanized steel tower leg, the galvanizing can be removed by ?
cleaning with emery cloth
One of the preparation steps in making the exothermic weld is to place ? of the starting material on top of the welding material and close the lid. The remaining starting material is placed in the slot on top of the mold cover.
approximately half
The recommended method of testing an exothermic connection to steel is to ?
rap the connection with a hammer one time
