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Wire-Arc Spray Gun: Two Crossed Wires, a Vibrating Arc and an Air Blast (Schoop, US 1,133,508, 1915)

Max Ulrich Schoop · Public domain (US patent drawing)

أنشأه

Forge

3. نوفمبر 2026

Wire-Arc Spray Gun: Two Crossed Wires, a Vibrating Arc and an Air Blast (Schoop, US 1,133,508, 1915)

The first wire-arc metal sprayer. Two metal wires are pushed through iron tubes until their tips cross. Current through the wires also runs an electromagnet that pulls one tube back, so a small arc springs between the tips and melts them; a jet of air blows the molten metal off as a fine spray and puts the arc out, the magnet lets go, the wires touch again, and the cycle repeats very fast. Result: a continuous spray of molten metal for coating a surface. Source: M. U. Schoop, US 1,133,508 (1915). Unknown: the wire metals and sizes, the coil, the air pressure. Picture: the patent drawing.

متقدم

Unknown

التعليمات

Make the feed tubes and rolls

Make two feed tubes ending in nozzles, preferably of iron. For each, mount a pair of feed rolls in a frame to push a wire through the tube. Set the tubes at about 90° to each other so the wires cross as they come out, the nozzles only a few millimetres apart. Mount one tube on an elastic support so it can move a little. Not given: sizes, the roll drive (the air blast may drive a small turbine for it).

المواد لهذه الخطوة:

أنبوب حديدي2 feed tubes

معدن غير معروف1 rolls, frames

نابض صفائحي1 elastic support

الأدوات المطلوبة:

مخرطة معادن

أبعاد غير معروفة

Fit the electromagnet

Wind an electromagnet beside the springing tube, so the tube is its armature. Wire the coil into the same circuit as the two tubes and wires, positive to one tube and negative to the other. When current flows the magnet pulls the tube aside and draws its wire slightly back from the other. Ours: enamelled copper wire for the coil. Not given: the coil.

المواد لهذه الخطوة:

سلك نحاسي مطلي بالمينا1 coil

معدن غير معروف1 magnet core

سلك نحاسي1 circuit leads

الأدوات المطلوبة:

طقم مفكات

Fit the air blast

Aim a blast pipe at the point where the wires cross, either close to it or 20-30 mm away, whichever sprays best for the metal. Feed it with compressed air or another gas. Not given: the pressure.

المواد لهذه الخطوة:

فوهة هواء1 قطعة

خرطوم هواء مضغوط1 قطعة

الأدوات المطلوبة:

ضاغط هواء صناعي

مفتاح ربط قابل للضبط

Spray

Load a wire of the coating metal in each tube and feed them until they touch. Switch on the current, generally 40 to 75 volts depending on the metal and wire thickness, and the air. The magnet pulls the wires apart, an arc melts their tips, the air blows the melt away as spray and snuffs the arc, the magnet releases, and the cycle repeats very rapidly. The positive wire burns faster, so feed it faster or use a thicker wire; match the feed to the melting. Hold the work in the spray. Without the vibration the arc flickers and the wires may weld together.

الأدوات المطلوبة: