MW-20 Webster Hardness Tester

Product Overview
MW series aluminum Webster tester is also called clamp type hardness tester, They are divided into MW, MW-20a, MW-20b three types, they are light and portable can be hold by one hand, do not need sample when testing, without high skill requirements. It can do fast NDT test of workpiece on site and meet the needs of quality control and qualified rate. It is widely used in production test, acceptance inspection and products quality inspection of aluminum industries and many companies of windows, door and curtain wall, as well as in engineering quality inspection and technical supervision departments. It is a necessary device in raising qualification rate and saving cost.

Function & application
Confirm the workpiece is heat-treated or not,

Whether the workpiece is made of improper alloy;

Testing over-long or over-weight workpiece;

Project acceptance of aluminum factories

Do project acceptance in companies of windows, door and curtain wall.

MW series webster hardness tester can be classified into four different types according to alloy content and hardness range. Except for MW-B92, each one has three kinds according to size of material.User should choose the right type to measure in case that you may damage the instrument.

Working Principle
MW series Webster hardness tester adopts indentation principle. Under pressure, the indentation is inversely proportional to the material hardness. HW is short for hardness of Webster, when the value is 16, it means the hardness is 16HW. The value can be read on the dial and can be changed into HV, HR. If the sample hardness is out of range, the needle will point at 20, if the range is too low, the needle will not move and it will stay at 0.

Working Conditions
The tester should be used in environment of clean, no vibration and no corrosive medium.

Instrument Features
No corrosion and keep precision after we have put them in salty water(5%) for 4 hour. After 100 times 0.5meters falling test, the pointer does not deflect.Thus to ensure the quality of the instrument.

Small portable instrument, small size, light weight, one-handed operation, can quickly measure the hardness of aluminum alloy;

Test process without sampling, can be non-destructive testing of material hardness;

Easy to learn, no high-skill skills of the operation requirements, the human operation on the measurement results less impact, very suitable for the production site for rapid hardness testing of materials;

There is no strict limit on the shape of the workpiece to be measured, suitable for the detection of different shapes of aluminum;

Equipped with calibration sets to solve the problem due to multiple full scale calibration if there is a calibration error;

Detection and display separated, to avoid blocking display so that user can not read the value.

Operating Method and Attentions
The use of the process should always pay attention to changes in instrument accuracy, by checking the instrument full scale point (20HW) and the calibration point is inaccurate to find inaccurate and timely correction;

The sample surface should be perpendicular to the pressure needle, the bottom of the sample should be closely fit with the anvil, otherwise it will produce measurement error;

The test should be applied once enough grip strength, slow afterburner will result in low measurement;

Instrument anvil and punch with the same hardness, in addition to check the full scale value, generally do not air play, air play will wear red needle, reduce the needle life;

Read the value of the handle should be maintained before the state of the same force until the pointer is stable and then read, read the pointer hardness value should ensure that the line of sight perpendicular to the surface of the dial to reduce the reading error;

In the test process should avoid the sample twist, otherwise it will cause errors and damage the pointer;

The meter head is an integrated part and can not be forcibly removed.

Instrument Maintenance
The instrument is a precision instrument, its life depends whether in proper use or good maintenance.User should always remember:

Prevent contamination, use soft cloth to clean the dust or stain of the tester especially remove the contamination on the dial head or it will cause error.

Prevent rust, when using pay special attention to its waterproof performance except clean it frequently, many parts will bear rust with water, the rust in the dial head will cause the instrument useless.

Prevent falling off, the tester is made up of many precision components, falling off will result in permanent damage to some parts.