Posted to News on 6th Apr 2020, 14:56
Metal-cored welding wire for low-temperature strength
ESAB Welding & Cutting Products is launching Coreweld 55 LT H4, the newest product in its series of Coreweld metal-cored wires designed for welding high strength steel (HSS). Coreweld 55 LT H4, which conforms to AWS A5.36 E91T15 M21A6-G H4 and EN ISO 18276-A T 55 6 Z M21 2 H5, offers a typical impact toughness of 110 J at -60degC, a yield strength greater than 550MPa, a tensile strength of 670MPa and less than 4ml diffusible hydrogen per 100g of deposited weld metal. Applications include semi-automatic and automatic welding of bridge members, crane arms and other lifting equipment, mobile machinery and hoppers and containers.
Neil Farrow, Global Product Manager - Cored Wires, ESAB says: "Coreweld 55 LT H4 is a fine-tuned, lower alloy wire (1.3 per cent Ni) which improves welder appeal with a smooth, stable arc at high welding speeds and good wet-out. It minimises spatter and silica islands, speeding post weld clean-up." He notes that Coreweld 55 LT H4 does not need a copper coating, eliminating the flakes that can block torch liners and cause downtime.
Produced and stocked in Europe, ESAB offers Coreweld 55 LT H4 in 1.2, 1.4 and 1.6mm diameters; it is available in 16kg packages and in a 255kg ESAB Marathon Pac.
ESAB now offers a total of five, European-produced, Coreweld metal-cored wires:
- Coreweld 46 LSLow silica, and especially for mechanised and robotic use
- Coreweld 46 LT H4Yield strengths > 460 MPa at -60degC
- Coreweld 55 LT H4Yield strengths > 550 MPa at -60degC
- Coreweld 69 LT H4 Yield strengths > 690 MPa at -60degC
- Coreweld 89 Yield strengths > 890 MPa at -40degC
As industry has trended toward HSS grades for lighter, higher performance structures, ESAB has responded with Coreweld metal-cored wires that further increase fabrication efficiency.
Neil Farrow says: "Coreweld HSS wires deliver sub-zero toughness and offer high deposition rates, high deposition efficiencies, faster travel speeds, excellent penetration and ease of use. Deposition rates can be as high as 8.0kg/hour."
Metal-cored wires also offer many other efficiencies compared with solid wires, including little to no post-weld clean-up, excellent sidewall fusion and root penetration, ability to bridge gaps without burn-through and ability weld thin materials at high amperages without burn-through.
For more information about Coreweld metal-cored wires go to www.esab.com.
