Described herein are examples of tool based welding technique monitoring systems that provide an inexpensive, intuitive, and relatively robust way of tracking an orientation of a welding-type tool, and providing welding technique feedback based on the orientation. The system requires no sensors apart from a simple and/or relatively inexpensive sensor module that can travel with the welding-type tool, which makes the system highly portable. The system can also provide some feedback with minimal calibration, which can be valuable in situations where an operator forgets, or is unwilling, to take the time to fully calibrate the system. Additionally, full calibration of the system can be accomplished with a fast, simple, intuitive calibration technique.

A plurality of welding torches, which are disposed in a welding device and are made movable in three-dimensional directions, are provided with welding wires that differ in composition and diameter from each other. When welding is performed in the horizontal direction, an arc is generated by at least two of the welding torches to form a bead while the welding wires are being fed. When welding is performed in the vertical direction, the arc is generated by any one welding torch of the two welding torches to form a bead while the welding wire is being fed. Thus, a steel sheet to which an anti-corrosion material has been applied can be welded continuously with high quality and high-efficiency in a horizontal orientation and vertical orientation.

A method comprises: providing a weldment and a welded plate to which the weldment is to be welded, an end of the weldment to be welded to the welded plate being provided with a first welding face and a second welding face, the first welding face and the second welding face forming a pointed cone, the first welding face corresponding to a first welding area, and the second welding face corresponding to a second welding area; in the first welding area, welding being performed at the innermost side of the pointed cone to form a first welding pass; in the second welding area, welding being performed at the innermost side of the pointed cone to form a second welding pass, and then welding being performed at the outer side of the second welding pass to form a third welding pass adjacent to the second welding pass.

A method comprises: providing a weldment and a welded plate to which the weldment is to be welded, an end of the weldment to be welded to the welded plate being provided with a first welding face and a second welding face, the first welding face and the second welding face forming a pointed cone, the first welding face corresponding to a first welding area, and the second welding face corresponding to a second welding area; in the first welding area, welding being performed at the innermost side of the pointed cone to form a first welding pass; in the second welding area, welding being performed at the innermost side of the pointed cone to form a second welding pass, and then welding being performed at the outer side of the second welding pass to form a third welding pass adjacent to the second welding pass.

A process for performing vertical upward using welding apparatus to form a weld bead on a workpiece that includes a welding gun and an electrode wire which is mechanically fed by the welding apparatus generally comprises (i) a step of welding the workpiece with the electrode wire feeding at a prescribed feed speed for a first predetermined duration where an arc is formed, and (ii) a step of halting the feeding of the electrode wire, as the welding gun is moved in the vertically upward direction, such that the arc is extinguished and so as to interrupt the step of welding for a second predetermined duration. As such, a weld pulse is formed, and by reiterating these steps a complete weld bead is formed from a plurality of the weld pulses.

Assembled submarine hull steel components, each steel component having a chemical composition consisting of, in weight percent:
0.030%C<0.080%
0.040%Si0.13%
0.1%Mn1.4%
2%Ni4%
Cr0.3%
0.30%Mo+W/2+3(V+Nb/2+Ta/4)0.89%
0.15%Mo0.89%
V+Nb/2+Ta/40.004%
Nb0.004%
Cu0.45%
Al0.1%
Ti0.04%
N0.0300%
impurities resulting from the production operation, said impurities including
B0.0005%,
P+S0.015%,
the balance being iron, the chemical composition complying with the condition:
410540C.sup.0.25+245[Mo+W/2+3(V+Nb/2+Ta/4)].sup.0.30460.