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- since 1996 -
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Technical Discussions
David Bunch
David Bunch
18:43 Jan-03-2010
Type 2 IIW Block

What are the soundpaths one should calibrate to on the IIW Type 2 Block when doing shearwave? I am only familiar with the IIW Type 1 block. Also, are there any disadvantages to using the mini-IIW type 2 block?

Thanks
David

    
 
 Reply 
 
john
john
18:53 Jan-04-2010
Re: Type 2 IIW Block
In Reply to David Bunch at 18:43 Jan-03-2010 (Opening).

use a ruler

    
 
 Reply 
 
Michel Couture
Michel Couture
19:35 Jan-04-2010
Re: Type 2 IIW Block
In Reply to David Bunch at 18:43 Jan-03-2010 (Opening).

David,

The difference between a Type 1 and Type 2 Block is the Type 2 doesn't have the slot on the flat 12 inches length. To calibrate your time base, position your echos at 4 and 8 on your screen. The range of your instrument should be 10 inches.

Another similar IIW Block may have its thickness half in the radius. If this is the kind of block you are using, you should than position the echos at 2 and 4 on your screen.

As John mentionned earlier, if you take a ruler and measure the distance between the point where your transducer should be positionned and the radius of the block, you shouldn't go wrong.

    
 
 Reply 
 
David Bunch
David Bunch
23:37 Jan-04-2010
Re: Type 2 IIW Block
In Reply to David Bunch at 18:43 Jan-03-2010 (Opening).

Thanks for the replies. I should have been more thorough in my original post though. I have an IIW Type 1 block, but it has been bashed and nicked. I'm looking to get a new block. In a previous post, someone mentioned that accuracy may be improved by calibrating on an IIW Type 2 block (over the type 1). I was just wondering what the calibration radius was for both reflectors on the Type 2.

But if the calibration radiuses are 4 and 8, I don't see much improvement over the 4 & 9 of the type 1.

    
 
 Reply 
 
Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
06:07 Jan-05-2010
Re: Type 2 IIW Block
In Reply to David Bunch at 23:37 Jan-04-2010 .

David

The types 1 and 2 both refer to the large A2 blocks (otherwise referred to as V1) with the 100mm radius. The A4 (V2) "kidney" block is portable and has 25mm and 50mm radii so with leg lengths of 25-50-25 its possible to calibrate for 100mm (25, 100) (1 and 4 in US parlance) and check your calibration by swivelling the probe to the 50mm radius to ensure A-scan shows a signal at 50mm.

    
 
 Reply 
 
Michel Couture
Michel Couture
17:39 Jan-05-2010
Re: Type 2 IIW Block
In Reply to Nigel Armstrong at 06:07 Jan-05-2010 .

David,

I would like to had a comment in reference to blocks. Personally, I prefer the A2 Block that we talked about. Becausee of their size, I find them easier to calibrate on, but they are also heavier than the A4 Kidney Block and therefore a little harder to log around. Regardless, the condition os the block will reflect directly on the accuracy of your calibration. I think that if you buy a new block, maybe you should also invest in a carrying case and keep your block in it unless you are using it.

    
 
 Reply 
 
David Bunch
David Bunch
00:27 Jan-07-2010
Re: Type 2 IIW Block
In Reply to David Bunch at 18:43 Jan-03-2010 (Opening).

I thought this was the IIW Type 2 Block. It looks like it has a normal 4" radius and a smaller radius, possibly a 2". http://www.stroudsystems.com/images/IIW2.jpg

    
 
 Reply 
 
marlon ramkissoon
marlon ramkissoon
00:32 Mar-08-2013
Re: Type 2 IIW Block
In Reply to David Bunch at 00:27 Jan-07-2010 .

Dear david i would like to get an expert advice on how to properly calibrate an IIW block i have seen a lot of people do it and its quite confusing for a new commer with littie experience!!!!!!!!!!

    
 
 Reply 
 
andrew cunningham
NDT Inspector
Canada, Joined Jun 2008, 238

andrew cunningham

NDT Inspector
Canada,
Joined Jun 2008
238
20:03 Mar-09-2013
Re: Type 2 IIW Block
In Reply to David Bunch at 18:43 Jan-03-2010 (Opening).

Hi David
The IIW V1 A1 has echoes 4” (100mm) then repeating every 5” (125mm). Excellent for 10” 250mm test rang. If you were learning ultrasonic,s in the 1950,s. Other uses for this block, a door stop, or knock out the Plexiglas you can chain enough together and make a boat anchor.
IIW V1 A2 has repeating echo of 100mm that is a good all round test range for testing the majority of welds.

    
 
 Reply 
 
Csaba Hollo
,
Retired, Canada, Joined Feb 2010, 301

Csaba Hollo

,
Retired,
Canada,
Joined Feb 2010
301
19:38 Mar-12-2013
Re: Type 2 IIW Block
In Reply to David Bunch at 18:43 Jan-03-2010 (Opening).

The type 2 IIW has two radii for range set up. In metric, it would be 50 and 100 mm soundpath, and imperial would be 2" and 4"

There are a couple of variations in a Type 1 block...I haven't used or seen one for so long, that I forget what the differences are, but I know the major radius reflector is 100 mm or 4"

    
 
 Reply 
 
ismet hoxha
NDT Inspector,
Italy, Joined Nov 2011, 49

ismet hoxha

NDT Inspector,
Italy,
Joined Nov 2011
49
23:29 Mar-12-2013
Re: Type 2 IIW Block
In Reply to David Bunch at 18:43 Jan-03-2010 (Opening).

David ,when the beam hits the big radius of the IIW 2, a part of sound is received by the probe so on the screen you have the first echo of 50, while the rest of the sound reflects on the straight part , where jackets the probe, and goes towards the small radius , bringing on the screen at the same time the echo of 75, and so on, then the sequence might be 50,75,125,..... clearly if you'll start by the small radius, the sequence is 25,75,100,.....of course still we can use this block for the calibration, but it was more important once for the analogue instrument calibrations, concluding I think IIW2 is a little exceeded, but hasn't disadvantages.
greetings

    
 
 Reply 
 
Mario Talarico
NDT Inspector,
Italy, Joined May 2010, 411

Mario Talarico

NDT Inspector,
Italy,
Joined May 2010
411
01:53 Mar-13-2013
Re: Type 2 IIW Block
In Reply to David Bunch at 18:43 Jan-03-2010 (Opening).

David,
from my II level. To calibrate paths with small IIW block type 2 start with 25 or 50 mm (small radius or large radius) and then add next paths by 75 mm each time (ie the sum of the two radii: 50 +25 = 75) .
Full scale 100 mm pointing radius 25: set first signal = 25 mm radius to 2.5 divisions; set second signal = 25 +75=100 mm to 10 divisions. Full scale 200 mm pointing radius 25: set first signal = radius 25 mm to 1.25 divisions , set second signal = 25 +75=100 mm to 5 divisions ; set third signal = 25 +75 +75 = 175 mm to 8.75 divisions.
Pointing radius 50, replace 25 with 50. Example 200 mm full scale pointing radius 50: 50 mm first signal ; 125 mm second signal (50 +75); 200 mm third signal (50 +75 +75). You can not do full scale 100 mm with a radius of 50 mm (first signal 50 mm, second 125 mm, that is more than 100 mm).
The block type 2 is very practical. A good policy may be big block IIW Type 1 in the laboratory with blocks DAC for check index, angles, etc., and small block type 2 in field (fits in your pocket !) for verification and changes the time base.
For longer path unfortunately you need the 100 mm radius of the block type 1, and for this there are no pockets……
Forgive the tedium of these numbers!
Greetings.
mario

    
 
 Reply 
 

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