How Do I Repair A Damaged High-Pressure Coil In A Waterjet Cutting Machine?

How to Repair a Damaged High-Voltage Coil in a Waterjet System?

Every WaterJet Cutting Machine operates under extreme pressure—sometimes exceeding 60,000 PSI. Within this high-pressure environment, the high-voltage coil (also known as high-pressure tubing or coil tubing) plays a vital role in safely transporting pressurized water from the waterJet Pump to the cutting head.

But what happens if this coil becomes damaged or cracked? Let's discuss proper maintenance welding techniques—because improper repairs can be more dangerous than the damage itself.

1. Understanding the Problem

Damage to the high-voltage coil can be caused by metal fatigue, vibration, or prolonged exposure to fluctuating pressure. Even a minor crack can lead to leaks, pressure loss, or even, in the worst case, a burst pipe. Before attempting any repair, the coil must be inspected and pressure-tested to confirm the extent of the damage.

2. Proper Welding Methods

The most recommended method for repairing a waterjet high-voltage coil is TIG welding (Tungsten Inert Gas Welding), also known as GTAW (Gas Tungsten Arc Welding).

Why TIG? Because:

1) It provides exceptional precision and control for thin-walled, high-grade stainless steel or alloy materials.

2) It produces clean, smooth welds without spatter or impurities.

3) It maintains the metal's original strength, which is crucial for handling ultra-high pressures.

In many KUNDA systems, the high-voltage coils are made of 316L stainless steel or special high-strength alloys, making TIG welding the safest and most stable option.

3. Proper Repair Procedure

1) Depressurize and drain the entire waterjet system.

2) Clean and inspect the damaged coil area for cracks or corrosion.

3) Repair the joint using argon-shielded TIG welding.

4) Polish and pressure test the weld area to ensure there are no leaks.

5) Reinstall the coil and verify stable operation at normal cutting pressure.

For larger damage or deeper cracks, a complete coil assembly replacement is often a more reliable option—KUNDA offers this service for all standard waterjet systems.

4. Why Choose KUNDA for Waterjet Maintenance

At KUNDA, we not only manufacture high-quality waterjet cutting machines, intensifiers, and high-pressure components, but also provide professional repair services and spare parts support.

Our high-pressure coils:

1) Made from high-quality imported stainless steel tubing

2) TIG welded and pressure-tested to ensure durability

3) Compatible with major waterjet brands

4) Easy to install and designed for long-term stability

We understand the financial cost of downtime, so our engineering team ensures every customer receives prompt technical guidance, replacement parts, and reliable after-sales support.

When a high-pressure waterjet coil is damaged, TIG welding is the most effective and safest repair method. It maintains the integrity of the metal and ensures your system operates safely at full pressure. If you require replacement parts or expert service, KUNDA's dedicated support team is ready to help you maintain smooth and safe waterjet operation.