heat input restriction
heat input restriction
(OP)
Dear friends
please say the range of heat input in LTCS (a333 gr6)welding and which std reference for this?
please say the range of heat input in LTCS (a333 gr6)welding and which std reference for this?





RE: heat input restriction
RE: heat input restriction
[i suspect there will be an SA-333 project in my near future]
RE: heat input restriction
I have often met up to -60F impact requirements with SMAW at 55+ KJ/in. In one instance in England, the original PQR referenced a heat input < 20 KJ/in. Both the client and I knew that the welders would never adhere to the requirement and as a result we witnessed qualification of a production weld made in the 5G position, recording and calculating a heat input of 53 KJ/in. It passed easily meeting absorbed value at -60 F using an E8018-C3 electrode and a GTAW root pass with 1% Ni bare wire filler metal. We then had them requalify a number of other similar "too low to be believed" heat input procedures to address the remainder of the work under B31.3.
We have typically qualified our low temperature (-50 F) carbon steel procedures using between 45 KJ/in and 55 KJ/inch, which is more typical of the actual heat inputs expected in the field when using 5/32" diameter electrodes.
I have been directing qualification of low temp (-50F) procedures since 1974.
RE: heat input restriction
And it is refreshing to see somebody recognize that ridiculously low heat inputs [<20KJ/inch] cannot be produced in the field with manual welding.