SG100S Spray Gun

As the most popular plasma spray gun, we offer the new SG100S spray gun. The main gas of the gun is argon, and the auxiliary gas is hydrogen or nitrogen. The spray gun provides the following accessories: nozzles, powder feeding tubes and powder feeding racks, water cables, electrode heads, insulators, sealing rings, special tools, etc. This type of spray gun is used for production thermal spray operations and can work continuously for long periods of time. The spray gun is widely used by users around the world and has been proven to be the most stable and reliable universal plasma spray gun, the spray gun has hundreds of customers in China, and mature use in the thermal spraying industry.

Working current: 100~1000A, working voltage: 30~80V for Ar+H2, 37~80V for N2+H2. This type of spray gun is used for production thermal spraying operations, and its maximum stable output power can be greater than 50KW.

Plasma spraying is carried out by using plasma arc, which is a compression arc, compared with the free arc, its arc column is thin, the current density is large, and the gas ionization degree is high, so it has the characteristics of high temperature, energy concentration, and good arc stability.

The gun uses a non-diverted arc: a plasma arc created between the cathode and the nozzle. In this case, the positive electrode is connected to the nozzle, the workpiece is not charged, and an electric arc is generated between the cathode and the inner wall of the nozzle, and the working gas is heated through the arc between the cathode and the nozzle, resulting in full or partial ionization, and then ejected from the nozzle to form a plasma flame (or plasma jet).

Figure: Internal structure of SG100S plasma spray gun

The SG100S gun is designed to deliver powder at low pressure in the feeder, unlike some guns that require a high-pressure feeder, which improves process stability.

Pictured: SG100S plasma spray gun

Figure: SG100S annular distribution of powder feed needle structure

SG100S The powder feeding design of the spray gun is 6 ring-shaped distribution of powder inlets, and the 6 nozzles are divided into two groups, each group has 3 powder feeding needles, and the finished product is distributed in a font shape. N1, N3, N5 three powder feeding needles are controlled by No. 1 powder feeder respectively, and N2, N4, N6 three powder feeding needles are controlled by No. 2 powder feeder, this powder feeding structure can make the powder evenly enter the flame center from the surrounding of the flame, and the distribution degree of powder melting is more consistent, so that the heat enthalpy value utilization rate of the flame is higher, and the powder melting effect can be effectively improved.

Features and technical specifications of SG100S plasma spray gun

• The main gas is argon, and the auxiliary gas is hydrogen or nitrogen.

• The spray gun provides the following accessories: nozzles, powder feeding tubes and powder feeding racks, water cables, electrode heads, insulators, sealing rings, special tools, etc. This type of spray gun is used for production thermal spray operations and can work continuously for long periods of time.

1.Aerospace: Spraying engine blades and landing gear to improve the high temperature, wear and corrosion resistance of parts to ensure flight safety.

2.Machinery manufacturing: Sstrengthen molds, shafts, gears, etc., enhance hardness, wear resistance, reduce wear, and improve life and efficiency.

3.Petrochemical industry: Protect pipelines, reactors, valves, anti-corrosion, high temperature resistance, and ensure the stable operation of equipment.

4.Power and energy: Maintain boiler pipes and turbine blades to resist erosion wear and corrosion, and improve operational reliability.

5.Medical devices: Spray biocompatible coatings on artificial joints and dental implants to reduce rejection.

6.Electronic information: Spray insulation and anti-static coating on electronic components and circuit boards to enhance stability.

Product Operate Guide     

Preparation:

Choose a ventilated environment free of flammable and explosive materials, and wear protective equipment.

Check the spray gun, powder feeding system, air source and power supply to ensure that all components are normal, install the spray gun and preliminarily adjust the air pressure, and turn on the power supply to standby.

Spraying parameter settings:

Set the powder feeding rate according to the coating and workpiece conditions, select the low powder feeding amount for the initial use, select the powder feeding mode and adjust the parameters.

Adjust the ratio of gas and accelerant flow to ignition, observe the flame flow, and adjust the valve to make the flame flow meet the spraying requirements.

Formal Spraying:

Hold the gun comfortably and keep it steady, and use the robotic arm to set the trajectory speed first.

Gun vertical workpiece, 100 - 300mm apart, spray sequentially at a constant speed, adjacent sprays overlap 1/3 - 1/2 width.

Wrapping Up:

Close the gas valve first, wait for the flame to go out, and then turn off the accelerant, powder supply, power supply, and gas source in turn to release the pressure.

Clean up the residue of the spray gun, clean the parts that are easy to block, replace the wear parts if necessary, check the records, and store them in a dry and ventilated place.

Q1: What is the maximum flame flow temperature that the SG100S gun can achieve?

A: Under ideal conditions, this spray gun uses a specific combination of fuel and accelerant, and the flame flow temperature can reach up to about 3500°C, which can meet the spraying needs of most high-melting materials, such as some high-temperature ceramic materials and the preparation of refractory metal coatings.

Q2: Does it have strict requirements for powder particle size? What is the applicable granularity range?

A: There are certain requirements, which are usually suitable for powder particle size ranges from 10 - 150μm. However, in practice, it is necessary to fine-tune the specific spraying process and material characteristics, such as finer ceramic powders for fine coating construction, and coarser metal powders for better wear-resistant coatings.

Q3: What should I do if I find that the powder melts unevenly during the spraying process?

A: Pause the spraying, check the flame flow status to see if the temperature is not enough or unstable, and optimize the flame flow by adjusting the gas and accelerant flow. At the same time, check whether the powder feeding system is blocked or unevenly fed, clean the powder feeding pipe, check the operation of the powder feeding motor, and adjust the powder feeding rate or change the powder feeding mode if necessary.