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Arc Welder: AC Transformer with a Sliding Shunt Core (Fanger, US 2,248,070)
An AC arc welder is a step-down transformer whose current can be turned up and down. H. J. Fanger (US 2,248,070, 1941) cuts a gap through one leg of a laminated ring core and slides a laminated iron shunt bar through it: pushed in, it carries flux past the secondary and lowers the welding current; pulled out, the current rises.
For arc welding he gives about 60 to 68 volts open circuit, 15 to 200 amps, dropping to 38 or 40 volts at the working arc, with a small coil on the shunt bar in series with the secondary.
Source: H. J. Fanger, "Welding Transformer", US Patent 2,248,070 (filed 1938, granted 1941). Picture: its Figs. 1-5.
Erfahren
Unknown
Anweisungen
1
1
Read Fanger
Read Fanger
"With arc welding, infinite control of the volume of the secondary current, between maximum and minimum is obtained by adjustment of the slidable shunt core without altering the welding characteristics of the current, also better ignition of the arc is had at a given voltage, and greater stability of the arc".
2
2
Stack the core
Stack the core
Build a single rectangular ring core of insulated iron laminations, held together with brass (or insulated) bolts or rivets in insulating tubes (Fig. 4). Cut a gap straight through one leg, accurately machined and finished, and make a circular joint through the opposite leg with the segments staggered to overlap in successive laminations. Core size, lamination iron and thickness are not given (ours: the tools).
Materialien für diesen Schritt:
Unbekanntes Metall1 iron laminations
Sechskantschrauben-Sortiment1 brass bolts
Unbekannter Isolierstoff1 insulating tubesBenötigte Werkzeuge:
Blechschere
Standbohrmaschine
Bohrersatz
Feilen (Handfeile)
Unbekannte Maße3
3
Make the shunt bar
Make the shunt bar
Make the sliding shunt section of the same laminated iron, a snug fit in the gap with its laminations edge-to-edge with the core's, and long enough to fill the gap at every position. Sheath both sides with a slightly wider plate of Bakelite that overlaps the edges of the gap to guide it. Fit a threaded rod on its outer end, working in a nut fixed to the section (or move it by hand, with calibration marks along one edge).
Materialien für diesen Schritt:
Unbekanntes Metall1 shunt laminations
Bakelit2 side platesSechskantschrauben-Sortiment1 brass bolts
Gewindestange1 Stück
Sechskantmutter1 StückBenötigte Werkzeuge:
StandbohrmaschineBohrersatzFeilen (Handfeile)4
4
Wind the coils
Wind the coils
Wind the primary and secondary windings on both legs of the core (Fig. 2), in series or in parallel to suit the line voltage and the current wanted. Wind a small auxiliary coil round the shunt bar's path, fixed so the bar slides through it, and connect it in series with the secondary through a reversing switch (some jobs weld better with the current through it one way). Turns and wire sizes are not given.
Materialien für diesen Schritt:
Kupferdraht1 insulation and size not givenBenötigte Werkzeuge:
Unbekannte Maße5
5
Spring the joints
Spring the joints
On both sides of the gap and of the circular joint fit pairs of confronting angle plates, held by brass bolts in insulating sleeves and drawn together by spring bolts whose heads rest on slightly arched spring plates, so the joints close snugly on the sliding bar. A small lever on the gap-joint nut gives a half turn to release the bar for moving. The angle-plate material is not given.
Materialien für diesen Schritt:
Unbekanntes Material4 angle platesSechskantschrauben-Sortiment1 brass and spring boltsUnbekannter Isolierstoff1 sleeves
Federstahlband1 arched spring platesSechskantmutter4 StückBenötigte Werkzeuge:
StandbohrmaschineBohrersatz
Rollgabelschlüssel6
6
Connect and set
Connect and set
Connect the primary to the line through a line switch, and the secondary leads to the electrode holder and the work. Pull the shunt bar out for more current, push it in for less: Fanger gives about 60-68 volts open circuit and 15-200 amps, dropping to 38-40 volts at the arc.
Materialien für diesen Schritt:
Ein-/Ausschalter1 line switchBenötigte Werkzeuge:
RollgabelschlüsselMaterialien
10- 1 shunt laminationsPlatzhalter
- 1 brass and spring boltsPlatzhalter
- 1 sleevesPlatzhalter
- 2 side platesPlatzhalter
- 1 StückPlatzhalter
- 5 StückPlatzhalter
- 1 insulation and size not givenPlatzhalter
- 4 angle platesPlatzhalter
- 1 arched spring platesPlatzhalter
- 1 line switchPlatzhalter
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