Zu den Faktoren Welche die Adhasion Lichtbogengespritzter Schichten Beeinflussen(Welding Physics, Process & Instrument)
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Die Adhasionskraft lichtbogengespritzter Schichten (F) wird durch Temperatur, Geschwindigkeit und PartikelgroBe des Schmelzmetalles beeinfluBt. Die Schmelzmetalltemperaturen werden in zwei Stufen des Flugprozesses ermittelt. Eine von ihnen (T_c) wird in der Adhasionsstufe mit einem Silikonolkalorimeter und die andere (T_i) in der Schmelzstufe durch die Kalkulation des Warmeeinganges veranschlagt. Die Schmelzmetallgeschwindigkeit (υ) und die PartikelgroBt wurden in der Flugstufe in der Luft durch eine Hochgeschwindigkeitskamera gemessen. (T_c), (T_i), (υ) und (D) mit mehreren Drahtvorschubgeschwindigkeiten wurden untersucht, wobei Aluminium und rostfreier Stahl als Spritzmaterial verwendet wurden. Dann wurde der Zusammenhang zwischen den Faktoren, die die Adhasionskraft der lichtbogengespritzten Schicht beeinflussen, erstellt. Die so erreichten SchluBfolgerungen werden folgenderweise zusammengefaBt: (1) (F), (T_c), (T_i) und (D) variieren entsprechend dem Verhaltnis der Vorschubgeschwindigkeit der positiven und negativen Drahte υ+/(υ_++υ_-) und sind aufdem Maximum, wenn υ+/(υ_++υ_-)=0.4-0.5. (2) (F) wird mit zunehmendem (T_c), (T_i) und (D) groBer. (3) Es wird angenommen, daB (T_c) der wichtigste Faktor in der Beeinflussung von (F) ist, und daB (T_c) durch das Verhaltnis des Drahtvorschubes oder (T_i) oder den Warmeeingang pro Einheitgewicht (Q_i) kontrolliert werden kann. Deshalb wird (F) maximal unter den Bedingungen, die ein maximales (T_i) und (Q_i) ergeben. Zusatzlich dazu wird (D) ebenfalls maximal.
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