5 Things to Consider When Choosing a Mag Particle Yoke [Checklist]

  •  

In this article we outline some key factors to consider when selecting the right electromagnetic yoke or contour probe for magnetic particle testing   

By Sakif Ferdous, Distribution Manager, and Wyatt Burns, Equipment Product Manager 

Yokes are some of the most versatile and trusted pieces of MPI equipment when you are out inspecting in the field. They also come in a variety of shapes and sizes, which means some yokes are more suited to your needs than others.  

Choosing the right yoke makes a tremendous difference to the inspector who is going to be using it over 8 hours a day under difficult conditions. Here are five things to consider when choosing the right yoke for the job. 

 

1. Weight 

How heavy does the yoke feel in your hand? Try holding it for more than a few minutes and ask yourself the same question. 

Not all yokes are weighted equal; some yokes are almost twice as heavy as others. When you are using a yoke all day, a heavier yoke can slow you down by 15% and cause fatigue. This is especially true if you are inspecting surfaces overhead or in difficult to reach areas.  

Another factor to check is if the weight is equally distributed across the yoke. Is the yoke bottom heavy? That could make it difficult to inspect sideways. Some yokes can cause wrist strain when used at awkward angles. Others may require the use of two hands to hold the yoke steady – effectively needing a second operator to disperse the powder. 

Figure: Differences between a bottom-heavy yoke vs a balanced yoke.  

A bottom-heavy yoke essentially becomes cantilevered when holding sideways, which requires more force at the handle to stabilize. A lightweight, balanced yoke is the best choice if you are inspecting for longer periods, and for overhead or hard-to reach areas. 

 

2. Ergonomics 

How does the yoke feel in your hand? Is it too big? Too small? Are there sharp edges that could get annoying over time? How does the trigger feel? Is it positioned in the right place?  

These are all questions that address how comfortable your work experience is going to be with the yoke in your hand.  

The ideal yoke allows the inspector to comfortably wield it with one hand, with a body that allows the fingers to grip it tightly and a trigger that is correctly positioned for use in all orientations.  

Figure: How the shape of the yoke affects the grip. 

 

3. Durability 

How long does the yoke need to last? Is it just for one job? Or do you need a yoke that will last a few years?  

Choosing a yoke that can survive the harshness of various tough environments  can be the difference between a smooth job and a frustrating experience.  

If you want to keep the yoke for a while, choose a yoke that you can easily service yourself. Be mindful of the most common points of failure for yokes – the cord and the trigger. Make sure the yoke you are investing in has a cord and trigger you can replace or repair yourself. 

 

4. Power 

How easily does the yoke pass the 10-lb test? Does it pass the same test after a day of work? What about after a year? 

Most new yokes today meet ASTM requirements for magnetizing power. However, some yokes can hold their magnetizing ability for longer than other yokes.  

Before any job, ensure the yoke you are using can still lift a 10-pound weight. Check for and replace rounded feet on the yoke to make sure you will always get good contact. Dual core yokes with coils above the yoke legs tend to be stronger than single core yokes with the coil in the handle. 

 

5. Desired Indications 

What type of indications do you need to find? Do you want to see sub-surface indications? Or only surface indications?  

It is easy to overlook this small detail but adding DC power to a yoke means adding substantially more bulk and weight. If all you really require is to see surface indications, opt for an AC yoke instead. 

 

Summary

There are a lot more options today in the world of yokes than there used to be. Gone are the days when operators had to live with a yoke that was uncomfortable - and sometimes dangerous - to use.  

When choosing your next yoke, consider the factors you learned today. Pick up a few different ones to see how each feel in your hand, and then imagine how they will feel after a full day's work. Think about which features you really need, and what you can live without. Consider how long you would like the yoke to last. With these factors in mind, you will pick the yoke that is best for you. 

 

Published June 4, 2019 

Please wait while we gather your results.

Related Blog Posts

The Clear Choice for Magnetic Particles

Learn what factors influence magnetic particle performance

Read More...

The most common incorrect assumptions about magnetic particle inspection

10 Misunderstandings about Magnetic Particle Testing [Video]

This article discusses the most common incorrect assumptions about magnetic particle inspection and gives you some solutions to combat these misunderstandings

Read More...

Carrier II Comparison to Water Baths Effect on Mag Particle Wet Bench Lifespan [Case Study]

Carrier II Comparison to Water Baths Effect on Mag Particle Wet Bench Lifespan [Case Study]

A brief overview of the 4 advantages of using a petroleum suspension vehicle bath to protect your magnetic particle wet bench investment.

Read More...

Mag Particle Settling Volume Test

Mag Particle Carrier Settling Test Performance [Video]

See how three common magnetic particle testing carriers perform in a standard ASTM E1444 settling volume test.

Read More...

Breaking Down How to Use Magnetic Flux Indicators and QQIs

Breaking Down How to Use Magnetic Flux Indicators and QQIs

In this article, we define Magnetic Particle Inspection Flux Indicator Strips and Quantitative Quality Indicators (QQI) and give a user manual approach to find artificial flaw standards.

Read More...

5 Things to Consider When Choosing a Mag Particle Yoke [Checklist]

5 Things to Consider When Choosing a Mag Particle Yoke [Checklist]

In this article we outline some key factors to consider when selecting the right electromagnetic yoke or contour probe for magnetic particle testing

Read More...

NDT Carrier Oil Fluid for Mag Particle Testing

Frequently Asked Questions About NDT Carrier Fluid

In this article, we explain what an NDT-approved carrier is and what sets it apart from commonly used, non-approved base oils

Read More...

Magnetic Field Safety Guidelines for Pacemakers

Magnetic Field Safety Guidelines for Pacemakers

This article reviews the limitations of operators with cardiac pacemaker’s exposure to magnetic particle inspection equipment.

Read More...

Magnetic Particle Crack Comparison

How Brightness and Contrast Impact NDT Inspections

How perception and vision can have a significant impact on probability of detection in non-destructive testing inspections.

Read More...

5-Point Guide to Yoke Best Practices

5-Point Guide to Yoke Best Practices

Learn how daily checks and maintenance can improve the lifespan of a yoke for a safer work environment

Read More...

5 Things to Consider When Choosing a Mag Particle Yoke [Checklist]

4 Habits of NDT Aerosol Safe Handling

Safety is a make-or-break factor in a technician's world – we list details around hazards, storage, recycling, and shipping of NDT aerosols

Read More...

Case Study – Documentation on ozone-depleting chemicals

Case Study – Documentation on ozone-depleting chemicals

Read More...

Aerospace MRO NDT

Case Study - Reducing Particle Loss During Mag Particle Testing

In this case study, we help an aerospace MRO customer resolve fluctuations in their magnetic particle concentration

Read More...

Case Study – Side-by-side evaluation of MAGNAGLO WB-12 and MAGNAGLO 14HF

Case Study – Side-by-side evaluation of MAGNAGLO WB-12 and MAGNAGLO 14HF

Read More...

Case Study – Understanding the implications of the new EMF regulations for magnetic particle inspection

Understanding the implications of the new EMF regulations for magnetic particle inspection

Read More...

Case Study – Use of MAGNAVIS® 8A Red for casting plastic numbers

Case Study – Use of MAGNAVIS® 8A Red for casting plastic numbers

Read More...

Changes to our Chemical Safety Information – January 2017

Some handy tips for beginners who are new to magnetic particle testing or NDT pros who want an easy reference guide.

Read More...

Discontinuation Notice – YM5 Permanent Magnet Yoke

Effective immediately, the Magnaflux YM5 Permanent Magnet Yoke (part number 001Y005) is discontinued.

Read More...

Safe handling of powdered materials and dusts

Safe handling of powdered materials and dusts

Safe handling of powdered materials and dusts

Read More...

Safety Data Sheets and Labels Have Changed

With the ongoing changes to European chemical safety regulations associated with REACH and GHS/CLP, Magnaflux EMEAR has revised its Safety Data Sheets (SDSs) and product labels to ensure that the information they provide is both up-to-date and compliant.

Read More...

The Control of Electromagnetic Fields at Work Regulations (2016)

The Control of Electromagnetic Fields at Work Regulations (2016)

The Control of Electromagnetic Fields at Work Regulations (2016), Electromagnetic Fields Directive, 2013/35/EU

Read More...

Subscribe to Magnaflux NDT Blogs:

Magnaflux

Faraday Road, South Dorcan Industrial Estate
Swindon, Wiltshire, SN3 5HE, UK
Telephone: +44 (0)1793 524566
Contact Magnaflux Customer Service

Select Your Country North America Mexico Brazil China Europe Russia India New Zealand, Australia, Japan, Southeast Asia
© 2021 Magnaflux - all rights reserved.
top

We have placed cookies on your computer to give you the best possible experience with our website. These cookies are also used to ensure we show you advertising that is relevant to you. If you continue without changing your settings, you are agreeing to our use of cookies to improve your user experience. You can click the cookie settings link on our website to change your cookie settings at any time.