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Dr. N. Subramanian General Sponsor
Joined: 21 Feb 2008 Posts: 5538 Location: Gaithersburg, MD, U.S.A.
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vikram.jeet General Sponsor
Joined: 26 Jan 2003 Posts: 3835
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Posted: Fri Apr 23, 2021 4:53 am Post subject: |
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Maximum fillet weld size
Just quoting from IS 816
Cl 6.2.2 Size of fillet weld shall not be less than 3mm, nor more than the thickness of thinner part joined.
Cl 6.2.5.1 Where a fillet weld is applied to the square edge of a part, the specified size of weld would generally be 1.5mm less than the edge thickness to avoid washing down of exposed arris.
Dr NS sir has already answered very nicely citing other international codes.
For a T joint , maximum size of fillet weld (in line with clause 6.2.2 of IS 816) is the thickness of thinner plate. No need to minus 1.5 mm.
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sakumar79 ...
Joined: 18 Apr 2008 Posts: 713
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Posted: Fri Apr 23, 2021 8:20 am Post subject: |
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Dear Senior engineers,
We often have to deal with tube sections which have thickness as small as 2 mm or 2.6 mm. How to adopt weld thickness in such cases? Min thickness of 3 mm and max of thinner sections will be contradictory. Also, is it practical to specify weld thickness with 0.1 mm accuracy like 2.6 mm or only rounded off thickness like 2 mm is practical to execute at site?
Thanks in advance
Yours sincerely
S Arunkumar
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vikram.jeet General Sponsor
Joined: 26 Jan 2003 Posts: 3835
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Posted: Fri Apr 23, 2021 9:31 am Post subject: |
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Dear Er
Clause 6.2.2 though contemplates minimum fillet weld size as 3mm , but also refers to Table 1 linked to this clause. This table 1 gives minimum size of first run or Single run fillet weld.
As per footnote 1 it is clearly stated that when the minimum size of fillet weld given in table is greater than thickness of thinner part, the weld should be equal to thickness of thinner part.. If thickness is 2mm ( for 15mm circular steel tube -light wt OR 2.6mm for 25mm hollow sq pipe ) , the weld size shall not be greater than thickness.
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sakumar79 ...
Joined: 18 Apr 2008 Posts: 713
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Posted: Fri Apr 30, 2021 7:29 am Post subject: |
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vikram.jeet wrote: | Dear Er
Clause 6.2.2 though contemplates minimum fillet weld size as 3mm , but also refers to Table 1 linked to this clause. This table 1 gives minimum size of first run or Single run fillet weld.
As per footnote 1 it is clearly stated that when the minimum size of fillet weld given in table is greater than thickness of thinner part, the weld should be equal to thickness of thinner part.. If thickness is 2mm ( for 15mm circular steel tube -light wt OR 2.6mm for 25mm hollow sq pipe ) , the weld size shall not be greater than thickness. |
Dear Er Vikram Jeet,
Thank you for the clarification. Also please clarify if accuracy of 0.1 mm in specifying weld thickness is practical from execution point of view.
Yours sincerely
S Arunkumar
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vikram.jeet General Sponsor
Joined: 26 Jan 2003 Posts: 3835
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Posted: Fri Apr 30, 2021 9:00 am Post subject: |
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Dear Er Arun ji
The tolerance limits for welding
In my opinion ,it is not desirable to give the tolerance value , it shall conform to some standard of BIS , otherwise to specification s of Govt Publications like CPWD specs.e tc.
May also see following standards in connection with welding
IS 9595
IS 822
Best wishes
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Abhishek_Singh Bronze Sponsor
Joined: 18 Nov 2010 Posts: 613
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Posted: Sat Aug 21, 2021 7:23 pm Post subject: |
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For heavy Tee joint go for Complete Joint Penetration weld. This way the strength of the joint is controlled by the base metal and not the weld. In other words, you dont have to design the weld.
Practically it is very hard to achieve CJP so we can go for Partial Joint Penetration (PJP) weld and follow AISC Table J2.5
For lightly loaded Tee Joint one may go for fillets.
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