🧪 DYE PENETRANT TESTING (DPT) – DETAILED SERVICE PAGE

Dye Penetrant Testing (DPT) Services in India

Dye Penetrant Testing (DPT), also known as Liquid Penetrant Testing, is a non-destructive testing method used to detect surface-breaking defects in both ferromagnetic and non-ferromagnetic materials.
It is widely used where surface integrity of welds and components is critical but magnetic testing is not applicable.

Jagdamba Technology provides professional Dye Penetrant Testing services for welded joints, castings, machined components, and fabricated structures, ensuring early detection of surface defects before failure.

Principle of Dye Penetrant Testing

DPT works on the principle of capillary action.
A low-viscosity penetrant liquid enters surface-opening defects. After excess penetrant removal, a developer draws the penetrant back out of the defect, creating a visible indication of its presence, size, and shape.

How Dye Penetrant Testing is Performed

1. Surface Cleaning
   The surface is thoroughly cleaned to remove oil, grease, paint, rust, or contaminants.

2. Penetrant Application
   Penetrant liquid is applied and allowed to dwell for a specified time.

3. Excess Penetrant Removal
   Surface penetrant is carefully removed without flushing penetrant from defects.

4. Developer Application
   Developer is applied to draw penetrant out of defects.

5. Inspection & Evaluation
   Indications are visually examined under proper lighting.

6. Post-Cleaning
   Surface is cleaned after inspection, if required.

Types of Dye Penetrant Testing

• Visible Dye Penetrant Testing

• Fluorescent Dye Penetrant Testing

Selection depends on inspection sensitivity and site conditions.

Defects Detected by DPT

• Surface cracks

• Porosity

• Pinholes

• Shrinkage cracks

• Surface laps and seams

Applications of Dye Penetrant Testing

• Weld inspection (CS, SS, aluminium, alloys)

• Castings and forgings

• Pressure vessels

• Non-magnetic materials

• Machined and fabricated components

Equipment & Materials Used

• Cleaner / remover

• Penetrant (visible or fluorescent)

• Developer

• Inspection lighting (white / UV as applicable)

Advantages of Dye Penetrant Testing

• Simple and effective surface inspection

• Applicable to non-magnetic materials

• Cost-effective method

• High sensitivity to fine surface cracks

Limitations of DPT

• Detects only surface-opening defects

• Requires proper surface preparation

• Not suitable for porous surfaces

Why Choose Jagdamba Technology for DPT Services

• Trained and experienced inspection personnel

• Proper surface preparation and dwell control

• Accurate interpretation of indications

• Clear and documented inspection reports