Arc welding

About: Arc welding is a research topic. Over the lifetime, 25393 publications have been published within this topic receiving 168182 citations.

Analysis of thermal stresses and metal movement during welding

Abstract: Finite element computer programs were developed to determine thermal stresses and metal movement during butt welding of flat plates and bead-on-plate welding along the girth of a cylindrical shell. Circular cylindrical shells of 6061 aluminum alloy were used for the tests. Measurements were made of changes in temperature and thermal strains during the welding process.

Real-time seam tracking control system based on line laser visions

Abstract: A set of six-degree-of-freedom robotic welding automatic tracking platform was designed in this study to realize the real-time tracking of weld seams. Moreover, the feature point tracking method and the adaptive fuzzy control algorithm in the welding process were studied and analyzed. A laser vision sensor and its measuring principle were designed and studied, respectively. Before welding, the initial coordinate values of the feature points were obtained using morphological methods. After welding, the target tracking method based on Gaussian kernel was used to extract the real-time feature points of the weld. An adaptive fuzzy controller was designed to input the deviation value of the feature points and the change rate of the deviation into the controller. The quantization factors, scale factor, and weight function were adjusted in real time. The input and output domains, fuzzy rules, and membership functions were constantly updated to generate a series of smooth bias robot voltage. Three groups of experiments were conducted on different types of curve welds in a strong arc and splash noise environment using the welding current of 120 A short-circuit Metal Active Gas (MAG) Arc Welding. The tracking error was less than 0.32 mm and the sensor’s metrical frequency can be up to 20 Hz. The end of the torch run smooth during welding. Weld trajectory can be tracked accurately, thereby satisfying the requirements of welding applications.

Apparatus and method for providing useful audio feedback to users of arc welding equipment

Abstract: The user of electric arc welding equipment is provided with audible feedback signals which provide useful information relating to the output current and voltage of the welder. An audio tone is generated and is frequency modulated by a signal which corresponds to welder output voltage. The tone is amplitude modulated by a signal corresponding to output current thus providing the user with a synthesized feedback signal having a voltage-proportional pitch and current-proportional volume. Additional modulation means are disclosed for introducing a current-proportional warble component to said tone.

Cored electrode with fume reduction

Abstract: A consumable welding electrode for electric arc welding in a shielding gas and producing reduced amounts of fume during said welding comprising in combination a steel sheath and a filler within the sheath. The filler including metallic aluminum powder and a dual stabilizing agent of sodium oxide and potassium oxide, wherein the dual stabilizing agent and said aluminum have about a 2.4:1 to 3.5:1 weight ratio.

Monitoring apparatus of arc welding

Abstract: PROBLEM TO BE SOLVED: To surely detect various welding state such as a state of arc generation, a state of molten pool and a shape of bead after welding. SOLUTION: The apparatus comprises two imaging means 10A, 10B to image a circumference of arc weld, a first band-pass filter 3 which is installed in an imaging range of one of the imaging means 10A and has a band-pass property in an infrared light wavelength region, a second band-pass filter 4 which is installed in an imaging range of the imaging means 10B and has a band-pass property in an ultraviolet light wavelength region, an illuminating means 5 having an emission spectrum of ultraviolet light wavelength region, an image composing means 6 to compose images taken by both imaging means 10A, 10B and an image display means 8 to display the image composed by the image composing means 6. COPYRIGHT: (C)2009,JPO&INPIT