INFLUENCE OF CHEMICAL COMPOUNDS ON THE FORMING OF WELDING ARC
Purpose. The purpose of work is a comparative analysis of chemical compounds influence on the process of forming arc welding and condition of its burning. Methodology. A wire with diameter 3 mm of low carbon steel with contain of carbon 0.15% was material for electrode. As chemical compounds, whic...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Dnipro National University of Railway Transport named after Academician V. Lazaryan
2014-10-01
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| Series: | Nauka ta progres transportu |
| Subjects: | |
| Online Access: | http://stp.diit.edu.ua/article/view/30824/28054 |
| Summary: | Purpose. The purpose of work is a comparative analysis of chemical compounds influence on the process of
forming arc welding and condition of its burning. Methodology. A wire with diameter 3 mm of low carbon steel
with contain of carbon 0.15% was material for electrode. As chemical compounds, which determine the terms of arc
welding forming the following compounds were used: kaolin; CaCO3 with admixtures of gypsum up to 60%; SiO2
and Fe − Si with the iron concentration up to 50%. Researches were conducted using the direct electric current and
arc of reverse polarity. As a source of electric current a welding transformer of type PSO-500n was used. On the
special stand initial gap between the electrode and metal plate was 1-1.5 mm. The inter electrode space was filled
with the probed chemical compound and the electric arc was formed. At the moment of arc forming the values of
electric current and arc voltage were determined. After the natural break of electric arc, the final gap value between
electrodes was accepted as a maximal value of arc length. Findings. Experimentally the transfer of metal in interelectrode
space corresponded to the tiny drop mechanism. According to external signs the relation between maximal
arc length and the power of electric current has the form of exponential dependence. Specific power of electric
arc at the moment of arc forming per unit of its length characterizes the environment in the interelectrode space.
Originality. 1) Based on the analysis of influence of the studied chemical compounds on the formation processes of
electric arc the inversely proportional relationship between the power of the electric current and the maximum arc
length until the moment of its natural break is defined. 2) Ratio between the maximal arc length and the power of
electric current, with the sufficiently high coefficient of correlation is submitted to the exponential dependence. Influence
of the compounds under study on the process of electric arc forming is determined using the indexes of degree
of the above mentioned correlation. 3) The value of specific power of electric current at the moment of electric
arc forming per unit of arc length can be accepted as the parameter, which characterizes the state of interelectrode
space environment. Practical value. In the conditions of identical adjusting force of electric current the sequence of
location of the studied compounds in the order of increase of their influence on the process of arcing is determined.
Minimum influence is observed from kaolin, and maximal one – from Fe − Si . |
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| ISSN: | 2307-3489 2307-6666 |