858 Percussion Welder

Model 858 Front Panel
Features & Settings

The standard system includes two primary components, the model 858 Percussion Welder and the 726 Bench Fixture.

This page shows the features, adjustments, and functions of the Model 858 Front panel to Join dissimilar metals, at almost any orientation, down to just a few thousandths of an inch. Weld without reducing the hardness of the metal, increasing resistance, or introducing incompatible material.

The 858 Percussion Welder Front panel makes micro-welding simple with the advanced features any type of micro welding is possible.
858 Front Panel
858 Front Panel

Adjustments & Features of the
Model 858 Front Panel

858 Front Panel

Actuator: The actuator setting
controls the charging voltage of the
capacitors that energize the
electromagnetic actuators. The range is
0 to 150 volts. The actuators move
the weldments together
during the welding process.

Delay: The delay is 0.5 to 5.0
milliseconds between actuator
initiation and discharge
of weld energy.

Weld: The weld energy voltage
control determines the charging
voltage applied to the
weld capacitors. The range
is 0 to 150 volts.

Mode: There are two mode settings,
regular and heavy-duty.
Heavy Duty adds an additional
bank of capacitors to
the weld output.

Pulse: The long / short pulse
width switch provides the
operator with pulse
width control. A long pulse
delivers less peak energy
for a long time
than a short pulse.

Polarity: Controls the direction of
weld energy electron flow.
The direction of electron flow
affects the amount of
heat applied to each weldment.

Capacitance: This setting controls the
amount of capacitance in the
weld output circuit. There
are three capacitance
ranges labeled 1, 2 and 3.



AC Input:

110-120 VAC 60 Hz 20 amp peak;

200~220 VAC 50~60 Hz 10 amp peak

Circuit Protection:

10 amp or 20 amp fuse  (see above)


Regular:          Bank 1       330 µF                       

                        Bank 2    1,830 µF                        

                        Bank 3    8,430 µF

Heavy Duty:    Bank 1  10,230µF                  

                        Bank 2  11,730µF                     

                        Bank 3  18,330µF

Bank voltage range:


Repetition rate:

Timing Delay:

0.5 to 5.0 milliseconds


Closed contact 15v


Positive  or  Negative:  User Selectable

Actuator Energy:

0 to 30 Joules into 0.6 ohms

Actuator Speed:

0-33 in/per sec.



Fan forced air


9”W    X   15”H   X   20”D

(229mm)   (381mm)   (508mm)


35lb (16kg)

Operation so simple and intuitive on model 858, we can show you how to use it in less than 60 seconds

If you’re like us, sometimes a picture (or video) is worth a thousand words. Watch our 60-second video showing you step-by-step how easy Percussion Welder 726 Bench fixture is to operate.

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For more demos, slow-mo’s, and closeups of the action.

Let's Talk

No matter what your micro-welding challenge is, the Percussion Welder team at MTI Microwelding is available to offer guidance, answer questions, and even run live, in-person tests using our equipment.