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Welding of Reinforcing bars
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sargo
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Location: Nasik-422003. cell - 09823193042

PostPosted: Tue Dec 16, 2008 4:09 am    Post subject: Welding of Reinforcing bars Reply with quote

Dear Sefians,
Is welding of reinforcing allowed by IS Code.
Then suggest me the minimum and maximum permissible welding length of bars in columns, footing raft for modile tower and in case of beams.
Please suggest also me the arrangement of bars in case of welding.

Govind Chhawsaria
098231 93042 


On Tue, 16 Dec 2008 ibarua wrote :
Quote:
15 Dec 2008


Shear in flat slabs: in LSM, shear rebars need to be provided only if the shear demand exceeds the shear capacity of the concrete section.

Indrajit Barua.

On Mon, 15 Dec 2008 ravindra.r wrote :

Quote:
sir,
While thanking you for the reply, I have certain more
queries on the same topic,
1.Dr Subramaniam mentions that ks for a wall is 1.
where is it mentioned in the code.
2. To prevent brittle punching failure many literature
mentions that shear reinforcement needs to be
provided.Is there any limit on the value of shear
stress beyond which shear reinforcement be provided for
ductile failure even though the slab satifies the
punching shear criteria.
-ravindra.r
atkins(india) ltd,bangalore








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vikram.jeet
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PostPosted: Tue Dec 16, 2008 12:11 pm    Post subject: Welding of Reinforcing bars Reply with quote

Dear Govind


Please refer to the IS Code IS 2751 code of practice for
welding of MSplain and deformed bars in RCconstruction

best wishes

vikramjeet

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rlal_sindri
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PostPosted: Tue Dec 16, 2008 2:20 pm    Post subject: Welding of Reinforcing bars Reply with quote

You can refer IS 9417 : 1989(1994) which incorporates the provisions for the welding of cold-worked steel bars conforming to Grade Fe 415 and Fe 500 of IS 1786 : 1985. Provisions for welding of mild steel bars for reinforced concrete construction have been covered in IS 2751 : 1979

Rajesh Kumar
Samsung Engineering (I) Pvt. Ltd

--- On Tue, 12/16/08, sargo <forum@sefindia.org> wrote:

[quote]From: sargo <forum@sefindia.org>
Subject: [SEFI] Welding of Reinforcing bars
To: general@sefindia.org
Date: Tuesday, December 16, 2008, 12:37 PM

Dear Sefians,
Is welding of reinforcing allowed by IS Code.
Then suggest me the minimum and maximum permissible welding length of bars in columns, footing raft for modile tower and in case of beams.
Please suggest also me the arrangement of bars in case of welding.

Govind Chhawsaria
098231 93042


On Tue, 16 Dec 2008 ibarua wrote :
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rlal_sindri
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PostPosted: Wed Dec 17, 2008 1:37 pm    Post subject: Welding of Reinforcing bars Reply with quote

You can refer IS 9417 : 1989(1994) which incorporates the provisions for the welding of cold-worked steel bars conforming to Grade Fe 415 and Fe 500 of IS 1786 : 1985. Provisions for welding of mild steel bars for reinforced concrete construction have been covered in IS 2751 : 1979

Rajesh Kumar
Samsung Engineering (I) Pvt. Ltd

--- On Tue, 12/16/08, sargo <forum@sefindia.org> wrote:

[quote]From: sargo <forum@sefindia.org>
Subject: [SEFI] Welding of Reinforcing bars
To: general@sefindia.org
Date: Tuesday, December 16, 2008, 12:37 PM

Dear Sefians,
Is welding of reinforcing allowed by IS Code.
Then suggest me the minimum and maximum permissible welding length of bars in columns, footing raft for modile tower and in case of beams.
Please suggest also me the arrangement of bars in case of welding.

Govind Chhawsaria
098231 93042


On Tue, 16 Dec 2008 ibarua wrote :
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sargo
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PostPosted: Thu Dec 18, 2008 5:39 am    Post subject: Welding of Reinforcing bars Reply with quote

Good Morning all sefians.
Thanking you to my reply on welding of reinforcing bars in RCC members.
In each reply, it is suggested that refer the code IS 2751 : 1979, which I do not have. So, please suggest me in brief the provision made in code also, email me scan copy of the said IS codes.

Govind Chhawsaria
098231 93042,
email : sargo@rediffmail.com , govindbecivil@gmail.com



On Wed, 17 Dec 2008 rlal_sindri wrote :
Quote:
You can refer IS 9417 : 1989(1994) which incorporates the provisions for the welding of cold-worked steel bars conforming to Grade Fe 415 and Fe 500 of IS 1786 : 1985. Provisions for welding of mild steel bars for reinforced concrete construction have been covered in IS 2751 : 1979

Rajesh Kumar
Samsung Engineering (I) Pvt. Ltd

--- On Tue, 12/16/08, sargo <forum@sefindia.org> wrote:

Quote:
From: sargo <forum@sefindia.org>
Subject: [SEFI] Welding of Reinforcing bars
To: general@sefindia.org
Date: Tuesday, December 16, 2008, 12:37 PM

Dear Sefians,
Is welding of reinforcing allowed by IS Code.
Then suggest me the minimum and maximum permissible welding length of bars in columns, footing raft for modile tower and in case of beams.
Please suggest also me the arrangement of bars in case of welding.

Govind Chhawsaria
098231 93042


On Tue, 16 Dec 2008 ibarua wrote :
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Rabinder Shekher
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PostPosted: Thu Dec 18, 2008 3:56 pm    Post subject: Welding of Reinforcing bars Reply with quote

Dear
Oxy-acetylene welding should never be used for welding reinforcing bars. Mild steel grade electrodes can be used of size 2 mm for 6 mm dia bars and 5 mm for 32-40 mm dia bars. 2.5 mm electrode size should be used for 10 mm dia bars and 3 mm of course for 20 mm dia bars
With regards
Rabinder Very Happy
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ranna
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PostPosted: Fri Dec 19, 2008 6:21 am    Post subject: Welding of Reinforcing bars Reply with quote

if weld is done both the faces the min weld length is FIVE times dia of bar
if it is in single side , it shd be 10 times dia of bar
ranna

rlal_sindri wrote:
Quote:
    You can refer IS 9417 : 1989(1994) which incorporates the provisions for the welding of cold-worked steel bars conforming to Grade Fe 415 and Fe 500 of IS 1786 : 1985. Provisions for welding of mild steel bars for reinforced concrete construction have been covered in IS 2751 : 1979

Rajesh Kumar
Samsung Engineering (I) Pvt. Ltd

--- On Tue, 12/16/08, sargo  wrote:

Quote:
From: sargo
Subject: [SEFI] Welding of Reinforcing bars
To: general@sefindia.org (general@sefindia.org)
Date: Tuesday, December 16, 2008, 12:37 PM

Dear Sefians,
Is welding of reinforcing allowed by IS Code.
Then suggest me the minimum and maximum permissible welding length of bars in columns, footing raft for modile tower and in case of beams.
Please suggest also me the arrangement of bars in case of welding.

Govind Chhawsaria
098231 93042


On Tue, 16 Dec 2008 ibarua wrote :
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arjunsasikumar
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PostPosted: Fri Jun 18, 2010 1:32 pm    Post subject: Reply with quote

IS 9417 : 1989(1994) which incorporates the provisions for the welding of cold-worked steel bars conforming to Grade Fe 415 and Fe 500 of IS 1786 : 1985.

Provisions for welding of mild steel bars for reinforced concrete construction have been covered in IS 2751 : 1979

But i need to know whether Hot Rolled Fe500(TISCON 500 and TISCON CRS) can be butt welded, if so kindly refer me the IS code

Regards,

P A Sasikumar
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sspawar
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PostPosted: Sat Jun 19, 2010 6:36 pm    Post subject: Reply with quote

Dear Mr. ARJUN,
For  this please read the FOREWORD of IS 9417:1989 and IS 1786:1985,
and also refer manufacturer's and other sites. (http://www.argeeinc.com/images/TATA_Tiscon.pdf, http://www.tatatiscon.co.in/projects/tiscon_500.htm, http://www.sefindia.org/?q=system/files/Journey.pdf) .

FOREWORD of IS 9417
This Indian Standard ( First Revision ) was adopted by the Bureau of Indian Standards on
13 February 1989, after the draft finalized by the Welding Application Sectional Committee had
been approved by the Structural and Metals Division Council.
This standard was first published in 1977, deriving assistance from DIN 4099 ( Part 1 )-1972
‘Welding of reinforcing steel - Requirements and tests’, issued by the Deutsches Institut
fur Normung and keeping in view the practices prevailing in the conutry at that time.
In view of the experience gained over the years in the welding of cold-worked steel bars, the
Committee has revised this standard by effecting the following major modifications:
a) Resistance but welding of cold-worked bars has been deleted since it is no longer in use.
b) A reference to gas pressure welding of cold-worked bars has been made. This technique
although being extensively used in some foreign countries, is relatively new and yet to be
commercially used in India.
This standard incorporates the provisions for the welding of cold-worked steel bars conforming to
Grade Fe 415 and Fe 500 of IS 1786 : 1985. For welding micro alloyed steel bars, a reference
may be made to IS 9595 : 1980 in regard to the provisions relating to carbon equivalent establishing
welding procedures and other relevant details.
For the welding of thermo-mechanically treated bars, the provisions would be covered at a later
date on necessary experience and data becoming available.
Provisions for welding of mild steel bars for reinforced concrete construction have been covered in
IS 2751 : 1979.

IS 9595:1980 ---Recommendations formetal arc welding of carbon and carbon manganese steels.

FOREWORD OF IS 1786
0. FOREWORD
0.1 This Indian Standard ( Third Revision ) was adopted by the Indian
Standards Institution on 1 May 1985, after the draft finalized by the
Joint Sectional Committee for Concrete Reinforcement had been
approved by the Civil Engineering Division Council.
0.2 Deformed bars for concrete ‘reinforcement are being produced in
the country for many years, the main processes being hot rolling or hot
rolling followed by cold twisting. In the past decade there has been an
increasing demand for higher strength deformed bars ( 415 N/mmz, Min,
yield strength/O.2 percent proof stress being the most common j. This
high yield strength was being first achieved by raising carbon and
manganese and to a great extent by cold twisting. In addition IO this,
there has been considerable demand for larger diameter bars with
similar strength, elongation, weldability and bendability as that of small
size bars. Along with this, the;e is also a need for these steel bars to
be welded and fabricated on the site easily. For this, strength and
ductility have to be achieved at the lowest possible carbon content.
0.2.1 Technological advances during the last few years in the field of
deformed bar production have helped in meeting all the above requirements
together. Microalloying with Nb, V, Ti and B, in combination
or individually, and thermomechanical treatment process are worth
mentioning in this field. With these two processes higher strength values
could be achieved at low carbon levels even in large diameter bars.
0.3 Two Indian Standard specifications, namely, IS : 1139-1966
‘Specification for hot rolled mild steel, medium tensile steel and high yield
strength steel deformed bars for concrete reinforcement ( revised )’ and
IS : 1786-1979 ‘Specification for cold-worked steel high strength deformed
bars for concrete reinforcement r second revision )’ covered deformed bars
for concrete reinforcement, To take advantage of the technological
changes, it is thought necessary to merge these two specifications giving
:IEE? option of the manufacturing process to the producers so as to meet
nlZ the requirements of the specification. Hence the revision of IS : 1139-
1966 and IS : 1786-1979 has been prepared combining them into a
single specification with modified designation and title. In this revision
the requirements of chemical composition have been modified, a new
strength grade Fe 550 has been introduced, Fe 250 and Fe 350 strength
grades have been deleted, requirements of modified bar geometry have
been made applicable to hot-rolled bars in addition to cold-worked bars;
further 4, 5 and 7 mm nominal sizes have been introduced; and a few
other changes found necessary as a result of experience gained have been
incorporated.
8.4 For the purpo.qe of deciding whether a particular requirement of
this standard is complied with, the final value, observed or calculated,
expressing the result of a test or analysis, shall be rounded off in accordance
with IS : 2-1960*. The number of significant places retained in
the rounded off value shoilld be the same as that of the specified value
in this standard.
1. SCOPE
I.1 This standard covers the requirements of deformed steel bars and
wires for use as reinforcement in concrete, in the following three strength
grades:
a) Fe 415,
b) Fe 500, and
c) Fe 550.


Regards

arjunsasikumar wrote:
IS 9417 : 1989(1994) which incorporates the provisions for the welding of cold-worked steel bars conforming to Grade Fe 415 and Fe 500 of IS 1786 : 1985.

Provisions for welding of mild steel bars for reinforced concrete construction have been covered in IS 2751 : 1979

But i need to know whether Hot Rolled Fe500(TISCON 500 and TISCON CRS) can be butt welded, if so kindly refer me the IS code


Regards,

P A Sasikumar
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Dr. N. Subramanian
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PostPosted: Sun Jun 20, 2010 11:45 am    Post subject: Reply with quote

Dear Er Sasikumar and Er Arjun,

As pointed out by Er Pawar, Carbon equivalent is more imp. for weldability. I think that all the steel reinforcement bars produced in India have low carbon and carbon eqivalent, and hence can be welded. Butt welding of rebars is not practiced and hence they are lap welded. For details of lap welding see the SP of BIS on detailing or the book on detailing by Prof. Prakash Rao, which is out of print but may be available in Libraries.

Regards,
Subramanian
sspawar wrote:
Dear Mr. ARJUN,
For  this please read the FOREWORD of IS 9417:1989 and IS 1786:1985,
and also refer manufacturer's and other sites. (http://www.argeeinc.com/images/TATA_Tiscon.pdf, http://www.tatatiscon.co.in/projects/tiscon_500.htm, http://www.sefindia.org/?q=system/files/Journey.pdf) .



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