Required clarification to read Rounded indications according to ASME SEC-VIII

[Kanikumar Kumar]

Dear Sirs,

I have some doubt regarding rounded indication (defects) in weld metal.

How much porosities (Numbers with size) are allowed in 3mm to 6mm material thk. According to ASME –VIII, Div-1 (Appendix 4)…

Because, In Appendix 4, FIG 4-3, lot of porosities are showed. So please Guide me.

 

Also suggest me how to read the standard with respect to Appendix-4.

 

I am waiting for your reply in this regards.

 

Thanks & Regards,

K.KANIKUMAR.

[meisam shokri arfaei]

There is table 4-1 which shows the acceptance limits regarding the type of rounded indications (random or isolated) by giving some examples and the relationship with the thickness. Generally in dissimilar thicknesses, the thinner part should be the criteria for decision (it is mentioned in 4-2-c).

So the max. dimension for rounded indication is 0.79mm for random, and 1.07mm for isolated indications regarding to your thinner thickness, 3mm. Please read 4-3 carefully for more details. 

Also Fig. 4-1 & 4-2 guide you about permissible length of indications (and not about size and number of indications).

In addition you can use fig. 4-3 for typical size, number and distribution of indications. Keep in mind that this figure is just a sample based on previous criterias and drawn for thicknesses between 3 to 6mm.

Regards

--
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-weld...@googlegroups.com.
To post to this group, send email to material...@googlegroups.com.
Visit this group at http://groups.google.com/group/materials-welding.
To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CACZz93D6agh%3Ds56KR86JpuhQTC04QsmSt5or%2B1GSJcowmNXBMg%40mail.gmail.com.
For more options, visit https://groups.google.com/d/optout.

--

M. Shokri Arfaei

ISA-ISTS - Metallurgy Lab. Manager

ASNT NDT Level III

International Welding Engineer

Tel.: +98 21 66282127

Fax: +98 21 66282779

Mob.:+98 912 1394023

[Kanikumar Kumar]

Sir,

Thanks for your kind reply.

I understood the max.size Rounded indication allowed for 3 to 6 mm.

for example; 3 mm thk.

According to fig 4-3,  Can I consider below 0.79 mm defect as a non relevant indications?

In this connection I am having 0.5 mm porosities 7 numbers Randomly... Can I accept?

Kindly explain about relevant and non relevant indication.. 

Thanks and regards,

K.KANIKUMAR

[meisam shokri arfaei]

In your case, for 3mm, please see table 4-1 with SI units. you could find that:

- Any rounded indication which has dimension greater that 0.38mm is relevant. It means that defects smaller than this size should be discarded and won't affect your interpretation ( so 0.5mm rounded indication is relevant).

- All other defects shall interpret with those criteria which discussed in the Appendix 4.

Regards

--
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-weld...@googlegroups.com.
To post to this group, send email to material...@googlegroups.com.
Visit this group at http://groups.google.com/group/materials-welding.

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/855b7c13-e85c-436d-a7db-5411263d420a%40googlegroups.com.

For more options, visit https://groups.google.com/d/optout.

[pkt...@gmail.com]

Please see the interpretation below, we can see that the formula shown in 4-3 take the precedence. 

Standard Designation: BPV Section VIII Div 1

Edition/Addenda:

Para./Fig./Table No:

Subject Description: Section VIII-1, Appendix 4

Date Issued: 02/22/1984

Record Number: BC83-578

Interpretation Number : VIII-1-83-221

Question(s) and Reply(ies): Question: 4-3 in Section VIII,

Division 1, gives formulas for

the maximum size of rounded

indications. If the maximum

size of an acceptable

rounded indication calculated

from this paragraph differs

from the examples in Table 4-

1 or the measured sizes in

Figs. 4-1 through 4-8, which

size shall be used?

Reply: The formulas shown in

4-3 shall take precedence.