ASME IX- Electrode Classification

[BPVN]

Hi,
Can you pls. let me know that, followings are correct classification of Electrode or not? Which i will have to use to qualify weld procedure!

AWS : A5.18-95
ASME Class: E70C-6-H4/E70C-6M-H4

Your prompt reply will be highly appreciated.
Thanks
BPVN

 

[metengr]

The suffix C or M after the electrode designation E70C-6X has to do with shielding gas type - C is for CO₂ and M is for Argon. The first classification E70C-6-H4 is missing a suffix after the 6. The H4 is a low hydrogen designator.

 

[BPVN]

Hi Metengr,
Thanks for quick reply!
Could i say missing suffix is C, than is this correct classification of Electrode ?
Pls. let me know ASAP.
Thanks in advance
BPVN

 

[metengr]

BPVN;
Yes, it could be C.

 

[gtaw]

In this case the letter "C" stands for composite or cored electrode. It is commonly called "metal cored" electrode and is included along with solid electrodes in AWS 5.18 and ASME SFA 5.18.

AWS A5.18 and ASME SFA5.18 electrodes are used for GMAW and GTAW when bare solid electrode/rod is used. They are commonly listed as ER70S-2, ER70S-3, etc. These are solid bare wire electrodes for carbon and high strength low alloy steels.

AWS A5.15 and ASME SFA 5.18 also include cored or composite electrodes used with the GMAW process. They are typically listed as E70C-2, E70C-3, etc. The -HX is the optional designator for diffusible hydrogen, H4 indicating the electrode will meet the requirement for no more than 4 ml of diffusible hydrogen per 100 grams of weld deposit. H8 would indicate the electrode will meet the requirement of no more than 8 ml of diffusible hydrogen per 100 grams of deposited weld metal.

While most cored electrodes and flux cored electodes are considered to meet low hydrogen requirements, i.e., no more than 16 ml of diffusible hydrogen per 100 grams of weld deposit, the coditions are that the wire is freshly removed from the manufacturer's sealed shipping container. Electrodes, both cored (metal core) and flux cored electrodes do not necessarily meet low hydrogen requirements. All tend to pick up hydrogen (generally in the form of moisture) over time.

When the letters "M" and "C" are use as suffix letters with flux cored electrode, i.e., AWS A5.20, the letter "C" indicates CO2 is the recommended shielding gas and the letter "M" indicates a mixed gas, i.e., Ar 75%/CO2 25% is the recommended shielding gas.

Best regards - Al

 

[gtaw]

Sorry for the Typo - it should read AWS A5.18, not AWS A5.15.

Best regards - Al