Ultrasonic Measurement Optimization of Spot Welding Diameter of Thin Plate Based on Gain Compensation Algorithm

In this paper, the control method of current gain compensation for welding is adopted. Precise current gain curves (i.e., current step curves) in resistance spot welding of galvanized steel plated are discussed and drawn. By analysis of failure of electrode cap, it indicates that new current step curve ensure that qualified welding spot nugget dimension is acquired. The welding spot is high in strength, stable and reliable in quality. It is superior to original current step curve.

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Silicon Photomultiplier Gain Compensation Algorithm in Multidetector Measurements

Metrology and Measurement Systems ◽

10.2478/mms-2013-0056 ◽

2013 ◽

Vol 20 (4) ◽

pp. 655-666 ◽

Cited By ~ 1

Author(s):

Mateusz Baszczyk ◽

Piotr Dorosz ◽

Sebastian Głąb ◽

Wojciech Kucewicz ◽

Łukasz Mik ◽

...

Keyword(s):

High Sensitivity ◽

Single Photons ◽

Temperature Influence ◽

Power Module ◽

Silicon Photomultiplier ◽

Temperature Variations ◽

Voltage Bias ◽

Compensation Algorithm ◽

Gain Compensation

Abstract The paper stresses the issue of strong temperature influence on the gain of a Silicon Photomultiplier (SiPM). High sensitivity of the detector to light (single photons) requires stable parameters during measurement, including gain. The paper presents a method of compensating the change of gain caused by temperature variations, by adjusting a suitable voltage bias provided by a precise power module. The methodology of the research takes in account applications with a large number of SiPMs (20 thousand), explains the challenges and presents the results of the gain stabilization algorithm.

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Effects of Micro Resistance Spot Welding Parameters to Weld Joint Quality on Aluminum Thin Plate AA 1100

International Journal of Technology ◽

10.14716/ijtech.v8i7.705 ◽

2017 ◽

Vol 8 (7) ◽

pp. 1306 ◽

Cited By ~ 3

Author(s):

Ario Sunar Baskoro ◽

Hakam Muzakki ◽

Gandjar Kiswanto ◽

Winarto PhD

Keyword(s):

Thin Plate ◽

Weld Joint ◽

Resistance Spot Welding ◽

Spot Welding ◽

Welding Parameters ◽

Resistance Spot ◽

Joint Quality

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Microstructure of resistance spot welding of maraging steels

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100177635 ◽

1990 ◽

Vol 48 (4) ◽

pp. 900-901

Author(s):

I. Neuman ◽

S.F. Dirnfeld ◽

I. Minkoff

Keyword(s):

Maraging Steel ◽

Spot Welding ◽

Lath Martensite ◽

Base Material ◽

Aging Treatment ◽

High Strength ◽

Maraging Steels ◽

Heat Treated ◽

Current Cycle ◽

Welding Processes

Experimental work on the spot welding of Maraging Steels revealed a surprisingly low level of strength - both in the as welded and in aged conditions. This appeared unusual since in the welding of these materials by other welding processes (TIG,MIG) the strength level is almost that of the base material. The maraging steel C250 investigated had the composition: 18wt%Ni, 8wt%Co, 5wt%Mo and additions of Al and Ti. It has a nominal tensile strength of 250 KSI. The heat treated structure of maraging steel is lath martensite the final high strength is reached by aging treatment at 485°C for 3-4 hours. During the aging process precipitation takes place of Ni3Mo and Ni3Ti and an ordered solid solution containing Co is formed.Three types of spot welding cycles were investigated: multi-pulse current cycle, bi-pulse cycle and single pulsle cycle. TIG welded samples were also tested for comparison.The microstructure investigations were carried out by SEM and EDS as well as by fractography. For multicycle spot welded maraging C250 (without aging), the dendrites start from the fusion line towards the nugget centre with an epitaxial growth region of various widths, as seen in Figure 1.

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