This invention relates to solid, bare, consumable wire electrodes for gas metal arc (GMA) welding of high strength low alloy (HSLA) steels. The electrodes require little or no preheat, interpass and post soak temperature controls. The invention also relates to the method of welding and weld deposits produced therefrom.

Welding of low alloy steel

Advanced consumable electrodes for gas metal arc (GMA) welding of high strength low alloy (HSLA) steels

Welding electrodes useful for gas metal-arc welding of low carbon steels such as HSLA and HY steels are provided. Those welding electrodes have a carbon content of up to about 0.05 weight percent, and form weld deposits with a low carbon bainitic ferrite microstructure and yield strength in excess of 80 ksi. More particularly, the welding electrodes have the following elemental composition ranges: 0.01 to 0.05 wt. % carbon, 0.7 to 1.8 wt. % manganese, 0.2 to 0.4 wt. % silicon, 1.0 to 9.0 wt. % nickel, up to 0.8 wt. % chromium, 0.4 to 1.5 wt. % molybdenum, up to 1.0 wt. % copper, up to 0.03 wt. % titanium, and up to 0.035 wt. % aluminum. The weld deposits resulting from those welding electrodes resist hydrogen induced cracking and may be used for welding naval hull materials without substantial preheating.

Welding electrodes for producing low carbon bainitic ferrite weld deposits

Consumable wire for improving mechanical properties of weld metal

A method for welding bodies made of very hard or highly refined armor steel, particularly objects to be armored against the penetration of projectiles, flying bodies, splinters or the like, wherein armor steel bodies arranged in juxtaposition with a gap therebetween are provided, in the region of the root of the joint, with preferably one bar each, and/or a filler body of, in particular, an unalloyed steel is arranged in the joint so as to cover the joint gap. The armor steel bodies are welded together without preheating with a suitable ferritic welding material, of like base, under a protective gas atmosphere and after cooling of the weld seam from the welding heat to not less than 100° C., the weld seam is heated locally and progressively without any holding period to at least 450° C. and subsequently, without maintaining a certain ambient temperature and/or period of time, the weld seam is cooled to ambient temperature in air. Alternatively, a like-base layer of armor is locally applied onto a wall of armor steel from a suitable ferritic welding material in that the welding area, which has been cooled from the welding heat to no less than 100° C., is heated locally and progressively without any holding period to at least 450° C., and subsequently the weld region is cooled in air without maintaining a certain time period and only the last (uppermost) welded layer of the weld region is again locally reheated, before being cooled from the welding heat to below 100° C., at least 450° C. without holding period and subsequently again cooled in air to ambient temperature without maintaining a cetain time period and or temperature.

Method for welding bodies made of very hard or greatly refined armored steel, respectively, and structures made according to this method

A steel composition having particular applicability to the manufacture of high-strength, low-alloy line pipe comprises 0.10 to 0.20 percent carbon, 0.85 to 1.25 percent manganese, 0.10 percent maximum phosphorus, 0.05 percent maximum sulfur, silicon in an amount not adversely affecting steel properties, 0.02 to 0.05 percent columbium, 0.10 percent maximum vanadium, an inclusion shape-control agent selected from the group consisting of zirconium, a rare earth or mischmetal, the balance iron.

Welded pipe structure of high strength low alloy steels

This invention relates to rods used for gas welding, especially oxyacetylene welding. In high-pressure steam power lines where temperatures up to 1100" F. are encountered, carbonmolybdenum alloy steel pipes are used because of their strength at high temperatures. The greater strength of such...

Welding of low alloy steel

Citations

Advanced consumable electrodes for gas metal arc (GMA) welding of high strength low alloy (HSLA) steels

Welding electrodes for producing low carbon bainitic ferrite weld deposits

Consumable wire for improving mechanical properties of weld metal

Method for welding bodies made of very hard or greatly refined armored steel, respectively, and structures made according to this method

Welded pipe structure of high strength low alloy steels

References

Carbon molybdenum welding rod

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