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In this paper, a single-phase 6KVA, 240VAC/30-70 VDC electric arc welding machine was designed and constructed using locally available materials.
Fig.1, block diagram of the AC/DC arc welding machine In view of the escalating cost of imported materials and finished end units for various applications, there is the need to harness and put together locally available materials in the desired shapes to achieve the equipment technological and scientific objectives.
The low cost developed machine is one of the most useful equipment in the construction industry where pieces of materials need to be welded together for specific application.
DebRoy: Modeling and real time mapping of phases during GTA welding of 1005 steel, Material Science and Engineering A (Switzerland) 333(12):320335, (2002)
Welding Journal 22(9) (1943):377-s to 422-s

Materials and Method Materials.
Geopolymers - Inorganic polymeric new materials.
Journal Thermal.
IEEE colloquium on Humanities, Science and Engineering Research
Metallurgical and Materials Transactions, Volume 33A, pp 1541-1547

Experimental Raw Material and Experimental Design.
Class Ⅱof fly ash was manufactured by New Materials Company of Yangzhou, with a specific surface area of 458m2/kg.
Wang: submitted to Journal of Construction and Building Materials(2007) [2] P.
Feng: submitted to Journal of Advanced Materials Research(2012) [3] X.
Chai: submitted to Journal of New Building Materials(2011) [5] J.

This kind of material can be widely used in building, chemical and shipbuilding industry as thermal insulation, sound absorption, corrosion-resistant and floating materials.
In this paper, foam glass insulation materials were made by using titania-bearing blast furnace slag-based stuff.
Journal of Environmental Sciences, 2004, 16(2): 302-307 [4] SteinerA, Ruud G C, Beerkens.
Formation of pores in granulated mineral materials under firing.
Journal of Iron and Steel Research,2005,17(5):22-25

Biosynthesis of poly-β-hydroxybutyrate as new material of food packing by various strains of methanotrophs from methane Shuai Zhang1,a; Jiaying Xin1,2,*,b; Linlin Chen1,c;YanWang1,d 1 Key Laboratory for Food Science and Engineering, Harbin University of Commerce, Harbin 150076, China; 2 State Key Laboratory for Oxo Synthesis & Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China aroson5@163.com, bxinjiaying@yahoo.com.cn, clinclear1207@yahoo.com.cn, dwangyan_123456@163.com Key Words：Poly-β-hydroxybutyrate (PHB); methanotrophic strain; Methane; Abstract: Poly-β-hydroxybutyrate (PHB) is a kind of polyesters.
Due to its biodegradability and other extraordinary properties, PHB could be ideal material for use in medicine, pharmacy, food packaging and agriculture.
Materials and methods Strain source Three kinds of strains were screened from the College of Food Engineering in Harbin University of Commerce.
Acknowledgements The authors thank the National Natural Science Foundation of China (20873034，21073050) and the Scientific Research Fund of Heilongjiang Provincial Education Department（11551z007）for support.
,Stottmeister, U.Journal of Biotechnology 86 (2001) 127–133.

Journal of Molecular Liquids, 218, (2016) 393-399
Journal of Molecular Liquids, 216 (2016) 503-509
Journal of Molecular Liquids, 219 (2016) 624-630
Shehzad, Nonlinear thermal radiation and cubic autocatalysis chemical reaction effects on the flow of stretched nanofluid under rotational oscillations, Journal of Colloid and Interface Science, 505(2017) 253-265
Čaplovič, Effect of the thermomechanical treatment on the structure of titanium alloy Ti6Al4V, Journal of Materials Processing Technology, 157(2004) 643-649

Experimental Materials and Methods In order to analyze the effects of temperature and confining pressure on the creep of rock with internal fractures, the creep tests under different temperatures and confining pressures were carried out.
Journal of Shandong University of Science and Techology (Natural Science), 2014, 33(03): 54-59
Journal of Coastal Research, 2020, (115): 556~560
[3] International Journal of Rock Mechanics and Mining Sciences, 1999 (1): 127-138
Journal of China coal society，2012, 37(S2): 275-279

Beijing: Science Press, (2009).
Science Press, Beijing (2000).
Saadeghvaziri: ACI Structural Journal, Vol. 94 (1997), p.558
(in Chinese) [8] Hefei Zhu, Qingli Wang, Yang Liu: Journal of Shenyang Jianzhu University (Natural Science), Vol. 24 (2008), p. 86.
[11] Yafeng Xu, Jingyi Zhao, Ning Li, Xiaoyi Lu: Journal of Shenyang Jianzhu University (Natural Science), Vol. 25 (2009), p. 482.

Yu: Journal of Building Structures in Chinese.
Chen: Journal of Hunan University (Natural Sciences) in Chinese.
Wei: Fire Safety Journal.
Lie: Journal of Structural Engineering.
Lu, and B Zhao: Fire Science and Technology (in Chinese).

adaoxinwu@126.com, btonghaixia@126.com, cxiachangbin@yahoo.com.cn Key words: Vanadium doped, rutile titania, Photodegradation Abstract: Vanadium doped rutile titania was prepared by low temperature hydrolysis using Tetrabutyl titanate as raw material.
Acknowledgements This work were supported by Scientific Research Fund of Hunan Provincial Science and Technology Department of P.R.C (2010GK3168). and Natural Science Foundation of Hunan Province P.R.C (10JJ5050, 11JJ5010).
:Journal of Chemical Society:Faraday Transactions, 1997, 93(8): 1647 -1654
,Arakawa H.: Journal of Molecular Catalysis A: Chemical, 2000,161 (1-2):105-113
Yin:The Chinese Journal of Nonferrous Metals，2008，18（1）：171~176.