Preheating 1045 1-1/2" diameter

By hogan

Date 09-16-2009 17:58

What table are you refering to?

By 803056

Date 09-17-2009 19:49

I would suggest you obtain a copy of "Weldability of Steels by R.D. Stout, published in 1987 by the Welding Research Council.

You might be able to get a copy off the internet. I just looked on Amazon, but they didn't have a copy.

Stout recomends a preheat of 400 (low hydrogen) to 450 (no hydrogen control) degrees F and a PWHT of 1150 to 1250 degrees F.

Best regards - Al

By cwi49cwe (*)

Date 10-05-2009 00:13

As a general rule, plain carbon steel preheat values are, if you take the carbon content, in this case .45 and add a "0" to it you'll have the approx. preheat temperature, 450F as a maximum. but there are always considerations and other important issues, such as inter-pass temp. What is the part being welded to, thickness, rate of cooling, is post weld heat treat included in the operation, etc. I've welded plenty of 1040, 1045, 1050, and 1070 and the above "general rule" has been sufficient but PWHT has always been in the operation to some degree, ( tool an die repair ). My copy of "Weldability of Steels" ,1978, R.D. Stout and W.D. Doty, Welding Research Council, 3ed Edition, 345 East 47th St. NY, NY.10017, MACK PRINTING CO., Easton, PA 18042 This one of the most important books I have EVER bought, 1st printing was in 1971
Page 380, item 153, SAE 1045, up to 1/2 inch, low-hydrogen - 300 deg., over 1/2 in. up to 4 in. , low-hydrogen - 400 deg., PWHT 1100-1250 deg. Hope this helps...............

By Superflux (****)

Date 10-06-2009 17:42

Gotta watch out for those "general rules".

"Page 380, item 153, SAE 1045, up to 1/2 inch, low-hydrogen - 300 deg., over 1/2 in. up to 4 in. , low-hydrogen - 400 deg., "
You've managed to dispute your own "Rule of thumb".

I once observed a welder preheating a 6 inch thick piece of Heel (Wear) bar on an Esco Shovel Bucket to 600F. Print/procedure called for 300F. Welder and shop foreman informed me that "XXX" QC guy told him preheat is "100 degrees per inch of thickness". This particular piece weighed in the neighborhood of one thousand pounds, plus the entire assembly was in excess of 30,000 lbs. Monumental task for one welder and a weed burner. The welder was preheating until 1st break and then after coffee had to reheat. Supervision was backing up the welder, justifiably so, and of course QC was being blamed for this lack of production.
I was just the FNG in the QC Dept. Since one of my team members was distributing this false info, it took some politicing to get everyone on the same page. It is hard sometimes to resolve these issues and still keep all parties on low decibel speaking terms.

By TSchmidt (*)

Date 09-21-2009 10:11

Hogan; table 3.2 in the 2008 code book.

By 803056

Date 10-05-2009 00:39

It isn't in Table 3.1 or 3.2 of D1.1 because it isn't prequalified for structural applications by D1.1.

1040 is an AISI/SAE designation, not ASTM or API.

Al

By ssbn727 (*****)

Date 10-05-2009 02:23

Hi Al it's not in mine either... Good catch Al! ;)
Just thinking a bit out of the box here so, forgive me if the question isn't relevant... Can the AISI/SAE designation (1040/1045) be crosschecked to see if there is an equivalent for it in ASTM or API list of steel grades?

Respectfully,
Henry

By 803056

Date 10-06-2009 03:27

In general, there are no published mechanical properties for AISI/SAE steels because the specifications only specify chemistry. Mechanical properties are dependent on both chemistry and state of heat treatment. Example: carbon steel - carbon content .5%, the steel can be quenched to maximize tensile strength at the expense of ductility. It can be annealed to maximize ductility at the expense of strength. It can be quenched and tempered to produce high hardness and recover some ductility at the expense of some hardness.

ASTM material specifications in contrast to AISI/SAE specifications provide information on the chemistry as well as the mechanical properties of the base metal involved, a basic consideration for both AWS structural welding codes and ASME B&PV codes.

Best regards - Al