AS1554.3 Welding of Reinforcing Steel
AS1554.3 Welding of Reinforcing Steel
(OP)
I understand that welding of reinforcing is to be avoided but looking through AS1554 there doesn't seem to be anything overly prohibitive there?
Am I correct in saying that if class N reinforcing is welded in accordance with Table 3.2 (ie W50X) no reduction in strength is required? Or are some intensive testing proceedures required?
I have only used welded reinforcing for cast-in-plates, tags etc..and adopted a 250 MPa yield stress for class N reo that has been hit with a weld, due to inhouse direction. Is this too conservative?
Thanks!
Am I correct in saying that if class N reinforcing is welded in accordance with Table 3.2 (ie W50X) no reduction in strength is required? Or are some intensive testing proceedures required?
I have only used welded reinforcing for cast-in-plates, tags etc..and adopted a 250 MPa yield stress for class N reo that has been hit with a weld, due to inhouse direction. Is this too conservative?
Thanks!





RE: AS1554.3 Welding of Reinforcing Steel
I don't think your inhouse direction is too conservative.
RE: AS1554.3 Welding of Reinforcing Steel
I am still confused by the fact that AS1554.3 has no statement about using a reduced yield stress for affected reinforcing. This leads me to believe that if the correct welding equipment is specified no reduction in fy is required. I have also read elsewhere in this forum about the American code permitting welding for specific reinforcing grades and equipment - but i don't know how this correlates to true blue steel.
If a reduction of fy is required for welded reinforcing can you direct me to any reference material that has the design requirements?
RE: AS1554.3 Welding of Reinforcing Steel
Other than poor welding practice, the other problem is embrittlement of large bars where small crossing bars are tack welded.
RE: AS1554.3 Welding of Reinforcing Steel
RE: AS1554.3 Welding of Reinforcing Steel
If welding to a plate you will be limited by the plate strength which will be 350 MPa at best.
RE: AS1554.3 Welding of Reinforcing Steel
So is 'properly' merely defined by the welding material as per AS1554 or is a more rigid specification required (again just for shop fabricated components)?
Thanks.
RE: AS1554.3 Welding of Reinforcing Steel
This document provides information on welding of 500PLUS Rebar. Procedure for specific weld types with advice on electrode types, weld length etc. is also included.
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RE: AS1554.3 Welding of Reinforcing Steel
RE: AS1554.3 Welding of Reinforcing Steel
Have you seen a similar document for standard N grade reinforcing?
RE: AS1554.3 Welding of Reinforcing Steel
RE: AS1554.3 Welding of Reinforcing Steel
RE: AS1554.3 Welding of Reinforcing Steel
Further to welding of N grade reinforcing bar, I was after clarification of allowable field bending and heating of reinforcing and subsequent reductions of capacities.
http://www.eng-tips.com/viewthread.cfm?qid=207584 has links to document that in summary states that:
Bars up to N16 can be cold bent (once) without reduction in yield strength (N16 have 5% reduction)
Bars above N16 can be bent once heated (within specified heat range) with a reduction of only 10% of yield capacity.
I was pretty surprised by the relatively minor reduction in capacities given the taboo mindset of heating reinforcing on site.
So:
Are these figures appropriate for N grade reinforcing?
What is the significance of the elongation reduction? Loss of ductility?
How can the specified heat ranges be enforced/monitored?
Is there a 'heating of reinforcing for dummies' document that could be given to a builder?
What would be appropriate capacity reductions for a bar that has been hot bent without not in accordance with these specifications (just a big mug with a gas torch)?
I understand that heating reinforcing should be avoided but I still wish to understand this for:
Assessment of the capacity of reinforcing that has already been heated and bent.
Guidelines that can be provided to site for critical applications (for heating and bending).
Many thanks!
RE: AS1554.3 Welding of Reinforcing Steel
Basically;
- cold bend around min. dia. pin as specified in code
- hot bend, OK if < 450 deg, reducing to 250 MPa yield if temp is > 450 deg & less than max. of 600 deg.
- Do not bend in same location more than twice.
Further info can be found here;
http://
RE: AS1554.3 Welding of Reinforcing Steel