Abstract
The experimental study is done for technological parameters of high-melting metal arc spraying to study the influence of spraying current, spraying voltage and wire feed voltage on spraying arc and the influence of spraying current on coating temperature and analyze theoretically the distribution rules of spray gun jet speed field and temperature field and their influencing factors. The results showed that the arc current increases along with arc voltage increase. The lower the spraying voltage is, the smaller the molten grain size becomes. However, if the arc voltage is lower than the minimum critical arc voltage of the material, the arc could not keep smooth burning. The spraying current has correspondence relationship with wire feed speed. The spraying current could be adjusted through wire feed speed adjustment.
Highlights
In the ark spraying process, the wire feeder is used to send continuously and evenly two electric conduction wires into two current conduction nozzles in arc pistol with the current conduction nozzles connected to positive and negative poles of the power supply and insulated before junction of two wires
The rapid moulding technology of metal arc spraying is a ”reproduction” moulding technology thatwith physical model as female die and arc as heat source [2], the melting metal materials are atomized with high speed airflow to form spraying grains, which are made to jet and deposit on the surface of female die to form compact metal coating in fixed thickness, known as die shell
Since the metal liquid drop size and diameter distribution are related to technological parameters such as fuse voltage, wire feed speed and atomization gas pressure, etc and the average temperature of metal jet flow is related to spraying distance, the combined method of experiment analysis and numerical calculation is used to build the relationship between spraying technological parameters and coating quality
Summary
In the ark spraying process, the wire feeder is used to send continuously and evenly two electric conduction wires into two current conduction nozzles in arc pistol with the current conduction nozzles connected to positive and negative poles of the power supply and insulated before junction of two wires. The processing cycle is 1/3-1/10 of the traditional steel die numerical control and the expense is 1/3-1/5 or lower, which becomes an important way for new product development and small lot production This rapid moulding technology has been widely applied to airplane, automobile, appliance, furniture, shoemaking, art-ware and other industries. To analyze for spray gun’s jet speed field and temperature field, master spraying mechanism and the deposition process of spraying grain have significant effect to reduce coating internal stress, control spraying coating quality and improve spray moulding technology level. Since the metal liquid drop size and diameter distribution are related to technological parameters such as fuse voltage, wire feed speed and atomization gas pressure, etc and the average temperature of metal jet flow is related to spraying distance, the combined method of experiment analysis and numerical calculation is used to build the relationship between spraying technological parameters and coating quality. QD8-LA arc spraying system and 3Cr13 martensite stainless steel wire with spraying diameter of are used to study in the experiment for the influence of spraying voltage and wire feed voltage on spraying current
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