Magnetic Particle Inspection Machine

Why Toshniwal Technologies Stationary Magnetic Particle Inspection Machines

Toshniwal Technologies Stationary Magnetic Particle Inspection Machines set the standard for Non-Destructive Magnetic Particle Crack Inspection. The Magnetic Particle Inspection Machines offer the flexibility, field intensity and part range capabilities to identify surface and sub-service defects across a broad range of parts.

Having options for all AC, FWDC and HWDC outputs, the Toshniwal Magnetic Particle Inspection Machines can identify both sub surface and surface cracks. Also, by applying both circular and longitudinal currents, the Magnetic Particle Inspection Machines can identify cracks in all directions simultaneously whereby saving time and energy of the user.

Stationary Magnetic Particle Inspection Machines - Application

Stationary Magnetic Particle Inspection Machines help identify cracks in ferromagnetic substances may they be raw materials or finished goods. Since it is non destructive testing, the sample is not at all damaged and can be further processed as desired by the customer.

By applying longitudinal and circular current on the sample, circular and longitudinal magnetic fields are created around the sample. If a crack is present, magnetic field lines will no longer be closed and north and south poles will be created. Once sprayed with fluorescent iron liquid or iron powder, due to the north and south poles, the tiny iron particles will be attracted to the crack. The crack will be visible under UV light or White light.

Stationary Magnetic Particle Inspection Machines are used mostly where the sample to be tested can be brought to the machine. They are also used in manufacturing facilities where large quantities of samples are to be tested.

Models

Magnetic Particle Inspection Machines are designed based on various factors that can change based on the part being inspected:

• Circular Magnetization Current: This is the straight current passed through the part being inspected. The intensity of the current will depend on the dimensions of the part.

• Longitudinal Magnetization Current: This is the current that passes through the coil/yoke. The intensity of the current will depend on the dimension of the part.

• Coil / Yoke: Logitudinal Magnetization is achieved through either a coil or a yoke. The decision to use a coil or a yoke will depend on the dimensions of the part.

• Clamping Length: This is the maximum clamping distance.

• Current Type: Half Wave DC (HWDC) / Full Wave DC (FWDC) / AC / Half Wave DC with AC (AHWDC) / Full Wave DC with AC (AFWDC). Current Type is decided after studying the inspection requirements

Toshniwal's MPI Machines are extremely customizable and innovative. Each machine is uniquely designed to offer the best value and the most user friendly experience.

Great Features of Toshniwal's Stationary Magnetic Particle Inspection Machines

• Infinite current control: Users can apply any value of current ranging between 0 and the maximum available, unlike other models where the value of current is determined by step increments

• Multi Directional Crack Detection: Toshniwal Magnetic Particle Inspection Machine generates both circular magnetism and longitudinal magnetism at the same time, resulting in multi directional crack detection

• Full Range of Currents: Toshniwal Magnetic Particle Inspection Machines come with the options of using all three currents – AC, HWDC and FWDC

• Surface and Sub Surface Crack Detection: Toshniwal Magnetic Particle Inspection Machines have the ability to identify both surface cracks and sub surface cracks

• Residual Inspection: Using FWDC or HWDC, samples can be further closely inspected because of the residual magnetic property

• AC Demagnetization: Residual Magnetism can be removed by using the AC demagnetization feature. Simply apply AC current and slowly reduce the applied current to zero. No need to acquire a Demagnetization machine

• Foot Switch: The current shots are fired through a foot switch instead of a hand switch. This feature frees up the hands of the users

• Auto Shower with Agitation: Toshniwal’s innovative automatic shower system sprays the sample with the liquid automatically after starting the experiment. The system will also agitate the liquid, ensuring that the iron particles will be mixed well with the liquid. The spray time can be changed by the user

• Pneumatic Clamping: The clamps used to hold the sample are pneumatically controlled

Benefits of Toshniwal Magnetic Particle Inspection Machines

• High Sensitivity – Small discontinuities and deep sub surface cracks can be detected

• Minimal surface preparation – No need to remove paint

• Customizable – The Magnetic Particle Inspection Machine can be designed entirely to fit the customer's requirements

• Cost Savings – Due to the economic cost of the product and its ability to non-destructively test samples, major cost savings can be achieved

• Quality – The Magnetic Particle Inspection Machine easily identifies defective parts, whereby improving quality of the lot being dispatched

Selecting the Appropriate Model

Diameter of the Sample: The greater the diameter, the greater the output current required. The basic thumb rule is 500Amps per inch diameter.

Length of the Sample: Bed Length of the Magnetic Particle Inspection Machine is designed based on the maximum length of the sample. Any sample smaller than that of the Bed Length can be tested but samples larger than of the Bed Length cannot.

Surface only or Subsurface crack detection: For surface only cracks, AC output Magnetic Particle Inspection Machine is needed which is satisfied with the AW Magnetic Particle Inspection Machine series. For subsurface and surface cracks, AHW Magnetic Particle Inspection Machine is recommended.

Wet or Dry Testing:

• Dry Method: Small iron particles powder is either applied by hand, thrown or sprayed using the squeeze bulb. After fully applying the powder, current is applied to the sample and testing is done

• Wet Method: The wet method utilizes liquid mixed with micro size iron particles which is then sprayed on the sample. This method is a faster method than the dry method since it is easier and faster to distribute the iron particles by spraying the liquid. This method also permits the use of smaller iron particles resulting in a finer identification of cracks. The liquid used in the Wet Method is recycled back into the tank whereby reducing the wastage of the iron particles. In case of dry, the used powder must be collected by the user