LongTeng E7015 DC Low Hydrogen Carbon Steel Welding Electrode

What LongTeng E7015 is

LongTeng E7015 is a basic-covered, low hydrogen stick electrode that the manufacturer lists to AWS A5.1 E7015 in the carbon steel electrode section of its welding materials catalogue. Its distinguishing feature within that section is the current type. The catalogue shows direct current, electrode positive, only, whereas the neighbouring E6013, E7016 and E7018 entries show AC or DC+. For a workshop with inverter or rectifier sets, that is no obstacle, and it is the reason this grade is associated with welders who prefer a DC arc for demanding joints.

The manufacturer states two uses: medium-carbon steel and low-alloy structures, and shipbuilding steel together with thick plates and general carbon steel structures. Seven Star LLC supplies LongTeng products to industrial customers in Oman and the GCC, with stock questions and technical follow-up handled from Muscat.

Catalogue figures for LongTeng E7015

The values below are typical values listed by the manufacturer. They describe a reference test result, not a promise for every lot, and the batch test certificate remains the controlling document.

Weld metal chemistry

The catalogue gives, in percent, carbon 0.087, manganese 1.12, silicon 0.58, sulphur 0.012, phosphorus 0.021, nickel 0.011, molybdenum 0.007, chromium 0.028 and vanadium 0.016. Silicon at 0.58 percent is the highest of the four carbon steel electrodes on the page, and sulphur at 0.012 percent is low, which is consistent with a clean low hydrogen deposit.

Current range for each diameter

Compared with LongTeng E7016, the 2.0 mm line starts at a higher 50 A rather than 40 A, and the 4.0 mm line reaches 220 A rather than 210 A. The difference is small, but it is a reminder to use the sheet for the exact grade rather than borrowing settings from a sibling.

The E7015 class in general terms (general class information)

These remarks describe the AWS E7015 class and are not LongTeng guarantees. The class carries a 70 ksi minimum tensile level, is usable in all positions, and uses a sodium-based low hydrogen covering that is designed for DC electrode positive. Compared with potassium-based E7016 and E7018 types it has a somewhat more digging, forceful arc and a less smooth surface, and the slag is thinner. Many welders value that stiff arc for root passes, tack welds and positional work where fusion into the parent metal is the priority. As with any low hydrogen class, the covering absorbs moisture from humid air, so electrodes should come from sealed packs or a heated holding oven, and exposed rods should be rebaked according to the manufacturer and code instructions. A short arc is essential to avoid porosity.

Handling and technique (general guidance)

Plan the work before opening the carton. Decide the diameter from plate thickness and joint type, check that the polarity switch or inverter setting is on DC electrode positive, and prepare the edges so that they are bright, dry and free from scale. Hold a tight arc and travel steadily, because the forceful arc of this class tends to undercut if the electrode is dragged too fast or held too long. In vertical-up welding a small weave with a brief pause at each side helps the bead tie in. Keep the unused electrodes warm and dry while you work, and return them to the oven rather than leaving them on the bench. Between passes, brush and chip the slag so that the next pass sits on clean metal. These habits apply to the whole class and allow LongTeng E7015 to deliver the sort of result that the catalogue table suggests.

Applications named by the manufacturer

• Welding of medium-carbon steel and low-alloy steel structures.
• Shipbuilding work on hull steel grades the catalogue names as A, B, D and E. Do not read this as an approval statement, because class society acceptance must be shown on a certificate.
• Thick steel plates, where a low hydrogen deposit lowers the risk of cold cracking.
• General carbon steel structures such as frames, supports and equipment bases.

Choosing LongTeng E7015 over similar grades

Pick LongTeng E7015 when your power source delivers DC, when the procedure specifies this exact classification, or when the stiff, penetrating arc suits the joint design. Pick the E7016 or E7018 grades if you need AC capability or a smoother finish. The catalogue lists 140 J at minus 30 °C for LongTeng E7015, against 170 J for E7016 and 145 to 150 J for E7018. Those numbers come from separate tests and should be compared only as the manufacturer’s reference values.

Teams preparing a welding station may also look at the Lincoln Electric Power Wave S500, the ESAB Rebel EMP 285ic, and, for rotating-equipment maintenance, the KOBELCO rotor assembly page. Check that the power source supports DC electrode positive stick welding before you select LongTeng E7015.

Datasheet and ordering

The catalogue extract that includes LongTeng E7015 is attached to this page and also covers E7016, because both grades appear on the same printed page. Send us the diameter, quantity, destination and any certificate requirement, and Seven Star LLC will reply with a quotation. Packaging details and delivery are confirmed per order. No approval is claimed for LongTeng E7015 on this page, and if one is needed we will ask the manufacturer for the supporting certificate. Request the LongTeng E7015 datasheet whenever you want to review the printed table in full.

When to ask us first

If your specification names a particular classification, a particular steel grade, or a particular approval body, send it to Seven Star LLC together with the enquiry for LongTeng E7015. We will compare it with the catalogue data, tell you honestly what the manufacturer lists, and request the paperwork that supports the batch. That approach avoids surprises at inspection and keeps procedure qualification records aligned with the electrode actually delivered.