· · 188 GMAW ultra low spatter welding technology Guangxian Zhang 1,2 , Hanbi Zhang 2 , Peng Li 2 (1.Shandong University, Ji'nan 250101, China; 2. Shandong AOTAI Electric Co., Ltd., Ji'nan 250101, China) Abstract: "GMAW Ultra Low Spatter Welding Technology" is a new type gas shielded metal arc control technology. This technology realizes wider range of low spatter welding by unique high precise arc control, which greatly improves arc stability and bead formation uniformity. Furthermore, it greatly improves bead appearance and welding efficiency in thin plate welding application. Key words: GMAW; ultra low spatter; welding DOI: 10.7512/ j.issn.1001-2303.2017.13.21 Dr. Guangxian Zhang, research staff in Electrical and Electronic engineering department from Shan- dong university, advisor for Ph.D. students, pro- fessor. He is the CEO of AOTAI electric Co., Ltd., which is the leading man- ufacturer of Inverter weld- ing and cutting equipments in China. His main research aspects include power electronic technology, CNC technology, special power and promoting the industrialization of scientific and technological achievements. He studied the inverter technology and the welding power source, solved the problem of the short life of inverter welding power source, low power factor, and the big splash of carbon dioxide gas shielded welding. 0 Introduction In modern industry, carbon steel, stainless steel and alloy steel are more and more widely applied. Structural parts and galvanized sheet are commonly used in vehicle manufacturing, fitness equipment, office furniture industries. These material is very sensitive to heat input, as a result lower heat input is preferable under the case that welding quality and bead formation is guaranteed. Besides, slag removal work in traditional GMAW application is a drawback. Traditional MAG welding can weld material stably, but minor spatters, low welding speed and high heat input (it burns workpiece) confine its application [1] . Even though pulse MIG can limit spatter effici- ently, but higher heat input is not suitable in thin plate, co-deposit sheet and large gap applications. What's more, pulse MIG can't work in CO 2 [2] . In recent years, those technologies which adopt wave control to limit spatter are widely used. They can reduce spatter in low welding parameters, but narrow parameter range and poor adaptability exit [3] . When welding current is high, or stick-out length changes severely, stable welding would be disturbed and spatter explodes [4] . This paper aims at widening welding current in low spatter appli- cation and improving low spatter welding stability and adaptability by analyzing GMAW drop transfer features. 1 "GMAW Ultra Low Spatter Welding Technology" principle and realization AOTAI MAG--350L precisely controls welding arc and molten pool by full digital control system, which can widen low spatter welding application and uniformize drop size efficiently. "GMAW Ultra Low Spatter Welding Technology" controls short- circuiting and re-arcing separately (as Fig.1). When short circuiting occurs, keep output current low to ensure wire and molten pool sufficiently contact, then increase current to accelerate drop transfer; when necking is forming, confine output current cdramatically to avoid spatter; after successful re-arcing, increase current to form drop again. In this way, uniformized arc length and drop size can be guaranteed. When welding parameters are increased, drop transfer method changes from typical short-circuit transfer to mixed transfer of various sizes of drops. Numerous spatters explode during light short-circuiting. Thereafter, welding machine should stop inverting to ensure sufficient contact between wire and molten pool when short-circuit is detected (as Fig.1 T 1 ~ T 2 ). Fig.1 "GMAW Ultra Low Spatter Welding Technology" control sketch Dr. Guangxian Zhang Email: [email protected]
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
is a new type gas shielded metal arc control technology.
This technology realizes wider range of low spatter welding
by unique high precise arc control, which greatly improves
arc stability and bead formation uniformity. Furthermore, it
greatly improves bead appearance and welding efficiency in
thin plate welding application.
Key words: GMAW; ultra low spatter; welding
DOI: 10.7512/ j.issn.1001-2303.2017.13.21
Dr. Guangxian Zhang, research staff in Electrical and Electronic engineering department from Shan-dong university, advisor for Ph.D. students, pro-fessor. He is the CEO of AOTAI electric Co., Ltd.,which is the leading man-ufacturer of Inverter weld-ing and cutting equipments in China.
His main research aspects include power electronic technology, CNC technology, special power and promoting the industrialization of scientific and technological achievements. He studied the inverter technology and the welding power source, solved the problem of the short life of inverter welding power source, low power factor, and the big splash of carbon dioxide gas shielded welding.
0 Introduction In modern industry, carbon steel, stainless steel and alloy steel are
more and more widely applied. Structural parts and galvanized sheet
are commonly used in vehicle manufacturing, fitness equipment, office
furniture industries. These material is very sensitive to heat input, as a
result lower heat input is preferable under the case that welding quality
and bead formation is guaranteed. Besides, slag removal work in
traditional GMAW application is a drawback.
Traditional MAG welding can weld material stably, but minor
spatters, low welding speed and high heat input (it burns workpiece)
confine its application [1]. Even though pulse MIG can limit spatter effici-
ently, but higher heat input is not suitable in thin plate, co-deposit sheet
and large gap applications. What's more, pulse MIG can't work in CO2 [2].
In recent years, those technologies which adopt wave control to
limit spatter are widely used. They can reduce spatter in low welding
parameters, but narrow parameter range and poor adaptability exit [3].
When welding current is high, or stick-out length changes severely,
stable welding would be disturbed and spatter explodes [4].
This paper aims at widening welding current in low spatter appli-
cation and improving low spatter welding stability and adaptability by
analyzing GMAW drop transfer features.
1 "GMAW Ultra Low Spatter Welding Technology" principle and realization
AOTAI MAG--350L precisely controls welding arc and molten pool
by full digital control system, which can widen low spatter welding