A method for welding multiple workpieces together includes applying a force to the multiple workpieces, generating ultrasonic vibration, transferring the ultrasonic vibration to the multiple workpieces to breakdown an oxide layer, generating an electric current, transmitting the electric current to heat up the workpieces, and synchronizing the ultrasonic and resistance heating operations. A welding system includes an ultrasonic vibration unit that generates an ultrasonic vibration and transfers the ultrasonic vibration to multiple workpieces to breakdown an oxide layer, a resistance heating unit that generates an electric current and transmits the electric current to heat up the workpieces, a workpiece mount that includes electrodes configured to receive the generated current and/or clamp the multiple workpieces during a welding process, and a controller configured to synchronize an operation of the ultrasonic vibration unit and an operation of a resistance heating unit.

The present disclosure relates to a system of modular functional blocks that may be used to facilitate easy assembly of a welding head assembly in any one of a wide variety of configurations to allow for distribution of welding wire, gas, cooling fluid and other media throughout an interconnected assembly of the modular functional blocks. As such, the modular functional blocks can be mixed and matched into any desired configuration as needed depending on the welding process being undertaken. The modular functional blocks may be in the form of one or more different welding wire delivery blocks, gas delivery blocks, cooling water delivery blocks, shim plates, end plates, shield cup, cover plates, insulating plates, etc.

The present disclosure relates to a system of modular functional blocks that may be used to facilitate easy assembly of a welding head assembly in any one of a wide variety of configurations to allow for distribution of welding wire, gas, cooling fluid and other media throughout an interconnected assembly of the modular functional blocks. As such, the modular functional blocks can be mixed and matched into any desired configuration as needed depending on the welding process being undertaken. The modular functional blocks may be in the form of one or more different welding wire delivery blocks, gas delivery blocks, cooling water delivery blocks, shim plates, end plates, shield cup, cover plates, insulating plates, etc.

A severing device for mechanically severing metal-containing 3D objects from a base plate of a 3D printing apparatus is provided. The severing device has at least one first machining unit firmly connectable to the 3D printing apparatus with at least one machining tool which has a working zone which encompasses at least part of an area of the base plate.

A severing device for mechanically severing metal-containing 3D objects from a base plate of a 3D printing apparatus is provided. The severing device has at least one first machining unit firmly connectable to the 3D printing apparatus with at least one machining tool which has a working zone which encompasses at least part of an area of the base plate.

A method connects at least two components made of different materials by thermal joining. The two components include a first component made of a material that is suitable for thermal joining and a second component made of a material that cannot be processed using the thermal joining method of the first component. The method includes introducing an auxiliary joining part into the second component forming a form-locking connection and/or a force locking connection. The auxiliary joining part of is made of a material that can be thermally joined to the first component. The first component is thermally joined to the auxiliary joining part in the second component so as to produce a connection between the first component and the second component. The thermal joining is carried out by a beam welding method.

A method connects at least two components made of different materials by thermal joining. The two components include a first component made of a material that is suitable for thermal joining and a second component made of a material that cannot be processed using the thermal joining method of the first component. The method includes introducing an auxiliary joining part into the second component forming a form-locking connection and/or a force locking connection. The auxiliary joining part of is made of a material that can be thermally joined to the first component. The first component is thermally joined to the auxiliary joining part in the second component so as to produce a connection between the first component and the second component. The thermal joining is carried out by a beam welding method.

A lap welding method of a steel sheet includes spot welding in a state in which the flange portion of a second steel sheet member having the flange portion and a standing wall portion is overlapped with the first steel sheet member, thereby forming a nugget between a first steel sheet member and a flange portion; and, after the spot welding, laser welding a region between an R stop of the standing wall portion and the nugget, thereby forming a weld bead, and, in the weld bead, a length dimension is equal to or longer than a diameter of the nugget, and a width dimension is 0.5 to 3.0 mm.

A lap welding method of a steel sheet includes spot welding in a state in which the flange portion of a second steel sheet member having the flange portion and a standing wall portion is overlapped with the first steel sheet member, thereby forming a nugget between a first steel sheet member and a flange portion; and, after the spot welding, laser welding a region between an R stop of the standing wall portion and the nugget, thereby forming a weld bead, and, in the weld bead, a length dimension is equal to or longer than a diameter of the nugget, and a width dimension is 0.5 to 3.0 mm.

A surface treatment system includes a holder configured to secure an object within the holder and a surface treatment device that is configured to treat a surface of the object within the holder with two types of surface treatments. The device is capable of producing a plasma or a flame at its nozzle for surface treatment. By controlling the materials supplied to the device and the way in which is operated, either a flame or plasma is produced. Thus, the surface treatment system is capable of treating a wide range of materials for printing by a direct-to-object printer.