CLASSIFICATION

ímet-7015C1L(H4R) are low-hydrogen sodium electrodes that have been designed to produce weld metal with increased strength without being air-hardenable or with increased notch toughness at temperatures as low as –75°C. They have been specified with nickel contents which fall into nominal levels of 2.5% Ni in steel.

With carbon levels of up to 0.05%, strength decreases and permits these Ni steel electrodes to be classified as E7015-C1L [E4915- C1L]. However, with lower levels of carbon, low-temperature toughness improves to match the base-metal properties of nickel steels, such as A516 Grade 60, 65, or 70, A537 Class 1 or 2 classifications (UNS Nr K02100, K02403, K02700, K12437). Thus, the intended application and the needed mechanical properties determine whether or not “L-Grades” should be selected.

Many low-alloy steels require post weld heat treatment to stress relieve the weld or temper the weld metal and heat affected zone to achieve increased ductility. It is often acceptable to exceed the PWHT holding temperatures as given below. However, for many applications, nickel steel weld metal can be used without post weld heat treatment. If PWHT is to be specified for a nickel steel weldment, the holding temperature should not exceed the maximum temperature given for the classification considered since nickel steels can be embrittled at higher temperatures.

Storage and Drying Conditions: Not recommended | Ambient temperature (For R-Class)

Hydrogen can have adverse effects on welds in some steels under certain conditions. One source of this hydrogen is moisture in the electrode coverings. For this reason, the proper storage, treatment, and handling of electrodes are necessary.

Holding Ovens: 125°C–150°C Drying Conditions: 250°C–425°C

CHEMICAL COMPOSITION OF UNDILUTED WELD

Single values are maxima, except where specified otherwise.

ALL-WELD-METAL MECHANICAL PROPERTIES

Preheat and Interpass :95-110°C | Post weld Heat Treatment : 605±15°C for 1 Hour(s) The temperature shall be raised at the rate of 85°C to 280°C per hour and allowed to cool at a rate not greater than 200°C per hour, and may be removed from the furnace when the temperature of the furnace has reached 300°C and allowed to cool in still air.

Single values are minimal.

Impact test specimens are tested without thermal treatment.

Limit of Moisture Content, % by weight max: 0.30 max (Reconditioned) | 0.40 (As Exposed) for H4 version Diffusible Hydrogen Content Average, Maximum, mL(H2)/100 g Deposited Metal: 4.00

Welding Considerations

Preheat and interpass minimum temperatures also have a significant effect on the strength levels attained with certain low-alloy steel weld metals. These weld metals are affected by rapid cooling rates which tend to produce more martensitic or bainitic microstructures. These microstructures will often exhibit higher yield and tensile strengths with a decrease in ductility.

The cooling rate can be retarded by utilizing a higher preheat and interpass temperature. The preheat and interpass temperature ranges given herein are adequate for the preparation of the test assemblies.

However, in actual production, users are encouraged to test their own procedures to verify that they have selected preheat and interpass temperatures which will produce desirable results in production.

SIZES & CURRENT CONDITIONS (DCEP)

NOTE: H4 R variant is available for supply on request.

WARNING: Safety and health information is available from many sources, including, but not limited to Safety and Health Fact Sheets listed in A11.3, ANSI Z49.1 Safety in Welding, Cutting, and Allied Processes published by the American Welding Society, 8669 Doral Blvd., Suite 130, Doral, FL 33166., and applicable federal and state regulations. The Safety and Health Fact Sheets are revised, and additional sheets added periodically.