Plasma Welding Machine for Welding Tantalum Tube Seals

Plasma welding machine is a device that uses plasma (i.e., high-temperature ionized gas) for welding. It is an advanced welding technology, typically used for fine welding, welding of heat-sensitive materials, or industrial applications that require high precision. Compared to traditional welding methods, plasma welding machines generate a high-temperature plasma arc, allowing for welding with very precise temperature and energy control.

Product Overview：

The core principle of plasma welding is to ionize gas (such as argon, helium, or nitrogen) into plasma through an electric arc. The high temperature produced by the plasma (which can reach thousands of degrees Celsius) melts the metal surface, forming the weld joint. The temperature of the plasma arc is higher than that of traditional welding methods, which allows for more precise control of the welding process while reducing the heat-affected zone.

Product Features：

High Precision: Plasma welding allows for fine welding in smaller spaces, making it suitable for welding small or complex parts.

Wide Applicability: It can be used for welding a variety of materials, including steel, aluminum, copper, stainless steel, titanium alloys, and more.

Small Heat-Affected Zone: Due to the concentrated heat source and high temperature of plasma welding, the heat-affected zone on the base material is smaller, which helps prevent deformation and damage.

Good Weld Quality: The weld surface is smooth, well-formed, and has high strength.

Purchase Information：

If you are interested in our plasma welding machine, feel free to contact us for more information and pricing.
Phone: +86 18516380382
Email: Jimmy@cysitech.com
Contact Person: Jimmy Hao
WeChat: +86 18516380382
Whatsapp: +8619339946898

Technical Specifications:

 Application Fields：

Plasma welding machines are widely used in industries such as aerospace, automotive manufacturing, medical devices, electronic equipment, and precision instruments, especially in applications that require high precision and strong weld strength.

Application Case: Welding Tantalum Tube Seals Using Plasma Welding Machine

Process Steps:

1. Preparation

Clean the surface of the tantalum tube: Tantalum is a material sensitive to oxidation, so the surface of the tantalum tube must be thoroughly cleaned before welding. Methods such as acid pickling, mechanical polishing, or plasma cleaning can be used to remove oxides, grease, and other impurities.

Choose the appropriate welding gas: Argon or helium is typically used as the shielding gas for tantalum tube welding to ensure no oxygen contamination during the welding process.

Set welding machine parameters: Based on the thickness of the tantalum tube and the welding requirements, set the appropriate current, gas flow rate, and welding speed. Plasma welding machines usually operate with higher currents to ensure adequate heating of the tantalum tube.

2. Fixing the Workpiece
Use a fixture to secure the tantalum tube in place, ensuring no displacement during welding. Ensure the welding area is aligned to avoid welding misalignment. If necessary, the sealing part of the tantalum tube can be used as the welding area.

3. Preheating (Optional)
Preheat the tantalum tube, especially for thicker tubes or when the ambient temperature is low. Preheating helps reduce thermal stress and prevents cold cracking. The preheating temperature is typically between 100-300°C.

4. Welding Process

Start the plasma arc: Heat the tantalum tube with an electric arc to form a stable plasma arc. The high temperature of the plasma arc locally melts the tantalum material, enabling welding.

Weld the seal: During welding, ensure that the sealing part of the tantalum tube melts sufficiently. Add an appropriate amount of tantalum welding wire or tantalum alloy wire to fill the weld seam. Maintain the stability of the plasma arc to avoid porosity and cracks.

Adjust welding speed and current: Adjust the welding speed and current based on the thickness of the tantalum tube and the welding requirements to achieve the best welding effect. Too low of a current may result in incomplete welding, while too high of a current may cause excessive heat input and damage to the base material.

5. Cooling Process
After welding is complete, allow the tantalum tube to cool naturally. During the cooling process, the tantalum tube may undergo some deformation, so ensure that the weld joint has completely solidified before cooling.

Slow cooling: Tantalum has high thermal conductivity, so the cooling rate after welding should be controlled to avoid the formation of cold cracks.

6. Post-Processing

Remove the oxide layer: After welding, a tantalum oxide layer may form on the tube. This layer needs to be removed using chemical or mechanical methods to ensure the surface of the tantalum tube is smooth and free of defects.

Quality inspection: Perform a weld inspection, including checking the strength, appearance, and sealing of the weld, to ensure the weld joint meets the required standards. Non-destructive testing methods such as X-ray inspection or ultrasonic testing can be used.

7. Leakage Testing

Leak-tightness testing: Check if the seal of the welded tantalum tube has good sealing performance. Methods such as pressure testing or gas leak detection can be used to ensure there are no small leakage points.