7/31/2019 TMT BAR

1/1

As Per IS 1786-1985 it stated as follows:

This standard covers the requirements of deformed steel bars and wires for use asreinforcement in concrete, in the following three strength grades:

a) Fe 415

b) Fe 500c) Fe 550

From the following table it is very much clear that for the guaranteed weldability the percentage

of carbon shall be restricted to 0.25 Percent , Maximum. But as per code acceptable percentage

of Carbon upto 0.30 & further 0.02 percent max over specified limit. So, apparently from the

chemical composition specified in the code it is not guranteed the weldability.

As per IS: 9417-1989, welding can be done over the TMT bar but it says in the clause number

12; Prior to production welding, test welds shall be carried out under the local production

conditions to establish the proposed joints can be made satisfactorily.

Test required: bend test, tensile test

So, it is not confirming the weld strength & also not giving any guaranteed for the

deposited weldment till we not confirm the maximum carbon content & the establishing

the welding procedure.

As per IS: 816-1969 (CODE OF PRACTICE FOR USE OFMETAL ARC WELDING FORGENERAL CONSTRUCTION IN MILD STEEL);

Clause number 3.1 Mild Steel All steel used for structural members and connectionsshall be mild steel of weldable quality conforming to IS:226-1969 orIS: 2062-1969 or equivalent.

There is also not mention of welding between Mild Steel material & the Thermo-mechanically treated steel.

So, welding between Mild Steel & TMT Bar is not recommended .