Launched Diploma in Quality Engineering

By Decibel -

Latest IMECHE Funded Training program for quality control has been started at Decibel

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Facts About NDT Training

By Decibel -
Now a days we came across hearing plenty of NDT training centres are offering NDT level 2 in Basic NDT methods like RT, UT, MT, PT etc within a duration of 15 days on 2- 4 hours training session per day.We are posting this article here for making aware the general public about the facts on what's NDT and How can be it acquired.Does'nt matter which training centre major factor shall be is there worth for what you pay and will it be recognized in industry and also will it be useful for the certified person because it's your hard earned Money is paying for each and every training programNormal NDT programs offered by Institutions are based on ASNT SNT 1A practice standard and which are accepted world wide if it's properly delivered.As per ASNT published  minimum training requirement each individual candidate should get a Minimum training hours for practical and theory for each method Eg: Ultraosonic Testing direct level 2 requires a Minimum Training hours of 120 for progr…
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Comparison of the use of rutile and cellulosic electrodes Knowledge Sharing From Decibel.

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Image
Comparison of the use of rutile and cellulosic electrodes Types of electrodes and their compositions Many types of manual metal arc (MMA) electrodes are available on the market. Depending on the main constituent of their flux, they are grouped into three categories: cellulosic, rutile and basic. All electrodes consist of a cored wire (typically 2.5–6mm diameter) coated by a flux. The core wire is generally made of low-quality riming steel and the fluxes contain many elements allowing refinement of the weld macrostructure. The composition of the flux impacts the electrodes’ behaviour. The main constituents of the different types of electrodes and the shielding gas created for each are described in Table 1 (Bowniszewski, 1979). Table 1 Main constituent of the three possible types of electrodes and shielding gas created by its combustion. Electrode typeMain constituentShielding gas createdRutileTitania (TiO2)Mainly CO2BasicCalcium compoundsMainly CO2CellulosicCelluloseHydrogen + CO2
MMA e…
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What is a Square Wave in Ultrasonic Testing

By Decibel -
Square wave is a shape of the signal
In the UT instruments the shape of firing pulse may be either spike or unipolar square wave or bipolar square wave; for the square wave firing pulse the half wave duration is tunable whilst the rising and falling edges should be kept as short as possible; also the stability of the amplitude should be provided within entire half wave duration. The video below shows the 3 types of firing pulse noted above - at the time of capturing of the video the standard load of 50 Ohm was connected to the pulser terminal, not the probehttps://www.youtube.com/watch?v=8HPKQ9gXooo&spfreload=10Upon the probe is connected the efficiency of the spike / unipolar and bipolar square wave may be understood based on the observation of the echo returned from the material - this is illustrated by the video belowhttps://www.youtube.com/watch?v=wyTTCLMNqXQThe half wave duration around 1/(2F) in the firing pulse (pulse Width) provides the maximal efficiency (F is the actual …
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