Current Welding Researches in U.S.A.

Some Trends in Current Researches on the Vitamin B Complex *

In describing the present situation with respect to our knowledge of the vitamin B complex** three topics appear to merit special attention because of the emphasis they are receiving in current research. The problems of the physiological role of the antineuritic vitamin and the exact chemical nature of this dietary essential still remain unsolved; and at the present time, much attention is bein...

Evaluating researches on urban housing indicators in current decade based on PRISMA method

Considering important role of housing in contemporary urban areas, evaluating urban housing quality has become one of the most popular topics in recent researches. Housing has vast conceptual perspectives which include many aspects of urban life beside the dwelling purpose of it, such as recreation, primary schools, and play yards and so on. The most efficient tool for achieving such purposes i...

Recent Researches in Metallurgical

Time-Frequency Entropy Analysis of Alternating Current Square Wave Current Signal in Submerged Arc Welding

The use of time-frequency entropy to quantitatively assess the stability of alternating current square wave submerged arc welding process considering the distribution features of arc energy is reported in this paper. Time-frequency entropy is employed to calculate and analyze the current signals under different duty cycle, frequency and welding speed in the submerged arc welding process. It is ...

Current Measurement of Resistance Spot Welding Using DSP

This study aims to calculate the resistance spot welding current digitally at a fast speed. The conventional open-loop spot welding machine cannot measure the current, thus the welding quality varies. The welding time of spot welder is very short, but the welding current is strong and it is hard to be measured, thereby resulting in the uncontrollability of welding quality. This study uses a hig...