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Handheld & Compact Ultrasonic Welders

The right Interface for the right environment

Seidensha’s line-up of handheld and mid-power JII SONOPET Ultrasonic Welders come in two configurations:

• The 4X0/9X0, Zero-Series with NO external parameter adjusting interface

• The 4X1/9X1, One-Series that offers a more conventional LCD and front button control center


The Zero-Series is ideal for mass-production environments where team leaders want to “set it and forget it”. This unit is intended to reduce the amount of operator adjustment that can be made without a supervisor’s approval.

Settings can be made either via our JII Plus Bluetooth app, our Hand Controller Unit (HCU), or via PC with our Windows Based J-Tool software.


 The One-Series offers a more direct adjustment method with an intuitive touch panel that offers immediate access to the weld output parameters and on-the-fly settings changes. Click the links above for more information on each series.

Versatile solutions for a range of applications.

Seidensha’s line-up of compact welding equipment comes in two power outputs, both offering a range of different frequencies.

The 400 line offers a maximum output of 420W in 19.15kHz, 28.5kHz, or 39.5kHz.

This line-up is ideal for handheld applications or for automated cells that don’t require heaps of power.

SONOPET JII 4x1/9x1JII Series JII 400 Series JII 900 Series Versatile solutions for a range of applications.

The 900 line offers a maximum output of 900W in 19.15kHz, 28.5kHz, or 39.5kHz.

This line-up is indented for automated cells that require a moderate amount of power.

We recommend this line for 6-Axis Robotic Arm systems. 

Used with our Welding Management Software

All of Seidensha’s JII welders can be used with our custom, Windows based software, J-Tool.


J-Tool allows for complete welder data management by recording the key parameter outputs and weld conditions for each weld point. 

Welding Management

External Transducer Switch – JII-SIU

In order to reduce costs, fabricators often opt to

have a single Ultrasonic Generator control multiple transducer units in sequence. While this adds to

the overall cycle time, this is a cost-effective way of addressing applications where having a 1:1 of Generators to Transducers isn’t feasible due to space, design, or budget.


Seidensha offers an external switch box that can be daisy chained one after the other to allow a maximum of ten (10) Transducer units to be controlled from a single generator. 

Portable Precision: Elevate Every Project
with Handheld & Compact Welders Across Ohio

For those seeking portability without sacrificing power, our handheld & compact welders are the perfect solution. Serving Mason, OH, we specialize in providing top-notch handheld & compact welders designed for both beginners and seasoned professionals. These innovative tools enhance your welding experience by delivering exceptional performance in tight spaces, making every project easier. With our range of handheld & compact welders , you can tackle various tasks efficiently while maintaining precision. Discover the convenience and versatility of our handheld & compact welders that streamline your workflow—because we believe that quality and portability should go hand in hand. Check out the handheld & compact welders available in your area!

Handheld & Compact Welders