Study of the operational parameters of plasma transferred arc melting and modelling of the process

Abstract

Plasma transferred arc (PTA) melting/alloying technique can be successfully used in various surface modification applications and has the potential for industrial use, replacing other more expensive techniques such as laser or electron beam. Such applications require tight control of the process parameters. There is a restricted field of PTA parameter values, where PTA melting can be successfully performed with smooth and unoxidised surfaces. The heat source efficiency of PTA treatment is strongly affected by welding current, arc length and travel speed of the arc and it takes values between 0 . 40 and 0 . 55, while melting efficiency takes values between 0 . 05 and 0 . 25, affected by the same parameters as arc efficiency. The microstructure and hardness of the melting zone of a PTA pass is associated with heat input and arc length.

Corrosion and Wear Properties of Composite Coatings Reinforced with Particles Produced by PTA on Steel Substrate in Different Atmospheres

“…Under the name of "TiB 2 ," the specimens were scanned with pure argon as plasma and shielded gas and under the name of "TiB 2 + N," with a mixture of argon and 5% nitrogen as plasma and shielded gas so as to achieve nitrogen absorption into the alloyed layer. The parameters of the process were carefully selected from a series of preliminary experiments [13] and are given in Table 1. More details regarding the equipment and process used are provided in a previous publication [14,15].…”

Κραματωμένες Επικαλύψεις Με Τη Τεχνική Μεταφερόμενου Τόξου Πλάσματος

“…Ο συντελεστής τριβής για το τριβοσύστημα επίστρωμα Β0 -εργαλειοχάλυβα σε όλα τα πειράματα τριβής παρέμεινε σταθερός και χαμηλός σε σχέση με άλλες έρευνες [224]. Η παρουσία οξειδίου στις πίστες τριβής σε συνδυασμό με τη μείωση του ρυθμού φθοράς και το χαμηλό συντελεστή τριβής οδηγούν στο συμπέρασμα ότι δρα οξειδωτικός μηχανισμός κατά τη διεξαγωγή των πειραμάτων [225][226].…”