How to Choose the Best Machine for Producing Johnson Screens (Wedge Wire Filter Tubes)

Johnson screens—also known as wedge wire filter tubes—play an essential role in mining, coal washing, water treatment, and stone filtration. Their strength, precision slot size, and long service life make them the preferred filter tube for heavy-duty industrial applications.
But to produce a stable, high-quality Johnson screen, choosing the right welding machine is critical.

Below is a simple guide to help you understand how to select the best equipment for manufacturing wedge wire screens.
1. Start With the Welding Precision You Need

The biggest advantage of a Johnson screen is its uniform slot size, achieved by welding V-shaped wires onto support rods.
To maintain this precision, the machine must provide:

Stable current output

CNC control for slot accuracy

High-temperature-resistant copper electrodes

Good welding precision ensures:

Higher filtration accuracy

Longer lifespan

Better resistance to pressure and corrosion

2. Check the Machine’s Clamping and Rotation System

A wedge wire screen is a round tube, so the clamping system must rotate smoothly while welding.
A reliable machine should offer:

Strong mechanical structure

Servo-controlled rotation

Auto-adjustment for different tube diameters

This ensures stable welding without deformation.

3. Consider the Machine’s Application Range

A high-quality machine should support different finished products:

Johnson screen

Mine water filter tube

Coal washing screen

Stone filtration tube

If you plan to enter multiple industries, choose a machine with adjustable diameter, wire type, and welding speed.

4. Prioritize Equipment That Reduces Labor and Maintenance

To keep your production stable and cost-effective, choose equipment with:

Automatic wire feeding

Automatic tube rotation

Minimal maintenance structure

Durable welding head

This directly affects your factory’s output and cost control.

5. Why Many Clients Choose DAPU

DAPU’s Wedge Wire Screen Welding Machine is engineered for precise and stable Johnson screen production, and many clients choose our equipment because it offers European-level performance at a far more affordable price. With over 26 years of manufacturing experience, DAPU provides machines that deliver long-term value without the high investment required by European brands.

✔ European-Grade Quality at a Better Price
Our machine delivers accuracy, welding stability, and durability comparable to well-known European equipment—but at a significantly lower cost. This makes it one of the most cost-effective options for startups and large factories expanding their filtration or mining screen production.

✔ Precise Slot Control
Each slot size remains consistent along the tube length. This precision improves filtration efficiency and ensures Johnson screens perform reliably in mining, water treatment, and sand control applications.

✔ High-Efficiency Welding System
The advanced synchronous welding technology creates strong bonding between V-wire and support rods, ensuring roundness and stability even under heavy working loads.

✔ Premium Copper Transformer
We use a pure copper transformer that provides stable current output and deep, uniform welding. It supports long welding hours and reduces maintenance downtime.

✔ Built for Continuous Operation
Clients often run the machine 10–12 hours per shift. The structure is optimized for stability, reduced heating, and long service life.

✔ Strong Industry Coverage
Screens produced by our machine are widely used in:

Coal and mineral separation

Groundwater filtration

Industrial filtration systems

Stone and sand screening

This versatility helps clients serve more markets with one line.

✔ Full Engineering Support From DAPU
Our team provides:

Line layout drawings

Operation videos

ROI calculation and cost-per-tube analysis

Local voltage customization

Installation guidance and long-term after-sales support

👉 Share your tube diameter + slot size + wire profile, and we will design a customized plan for your Johnson screen production line.