[용접교육] GMAW 보호가스 (아르곤 + 산소) 특성 쉬운이해~!!! MIG Shield Gas Argon with Oxygen 1% 2% 5% 8% Characteristics
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- Опубликовано: 11 сен 2024
- Advantages of GMAW
The GMAW process enjoys widespread use because
of its ability to provide high quality welds, for a wide
range of ferrous and non-ferrous alloys, at a low price.
GMAW also has the following advantages:
• The ability to join a wide range of material types and
thicknesses.
• Simple equipment components are readily available
and affordable.
• GMAW has higher electrode efficiencies, usually between
93% and 98%, when compared to other welding processes.
• Higher welder efficiencies and operator factor, when compared
to other open arc welding processes.
• GMAW is easily adapted for high-speed robotic, hard
automation and semiautomatic welding applications.
• All-position welding capability.
• Excellent weld bead appearance.
• Lower hydrogen weld deposit - generally less than
5 mL/100 g of weld metal.
• Lower heat input when compared to other welding processes.
• A minimum of weld spatter and slag makes weld clean up fast
and easy.
• Less welding fumes when compared to SMAW (Shielded
Metal Arc Welding) and FCAW (Flux-Cored Arc Welding)
processes.
Benefits of GMAW
• Generally, lower cost per length of weld metal deposited when
compared to other open arc welding processes.
• Lower cost electrode.
• Less distortion with GMAW-P (Pulsed Spray Transfer Mode),
GMAW-S (Short-Circuit Transfer Mode) and STT™ (Surface
Tension Transfer™).
• Handles poor fit-up with GMAW-S and STT modes.
• Reduced welding fume generation.
• Minimal post-weld cleanup.
Limitations of GMAW
• The lower heat input characteristic of the short-circuiting
mode of metal transfer restricts its use to thin materials.
• The higher heat input axial spray transfer generally restricts its
use to thicker base materials.
• The higher heat input mode of axial spray is restricted to flat
or horizontal welding positions.
• The use of argon based shielding gas for axial spray and
pulsed spray transfer modes is more expensive than 100%
carbon dioxide (CO2).
Axial Spray Transfer
Axial spray metal transfer is the higher energy mode of metal
transfer, whereby a continuously fed solid or metal-cored wire
electrode is deposited at a higher energy level, resulting in a
stream of small molten droplets. The droplets are propelled
axially across the arc.
Axial spray transfer is the higher energy form of GMAW metal
transfer. To achieve axial spray transfer, binary blends containing
argon + 1-5 % oxygen or argon + CO2, where the CO2 levels
are 18% or less. Axial spray transfer is supported by either the
use of solid wire or metal-cored electrodes. Axial spray transfer
may be used with all of the common alloys including: aluminum,
magnesium, carbon steel, stainless steel, nickel alloys, and
copper alloys.
For carbon steel, axial spray transfer is applied to heavier section
thickness material for fillets and for use in groove type weld
joints. The use of argon shielding gas compositions of 95%, with
a balance of oxygen, creates a deep finger-like penetration
profile, while shielding gas mixes that contain more than 10%
CO2 reduce the finger-like penetration profile and provide a
more rounded type of penetration.
The selection of axial spray metal transfer is dependent upon the
thickness of base material and the ability to position the weld
joint into the horizontal or flat welding positions. Finished weld
bead appearance is excellent, and operator appeal is very high.
Axial spray transfer provides its best results when the weld joint
is free of oil, dirt, rust, and millscale.
Advantages of Axial Spray Transfer
• High deposition rates.
• High electrode efficiency of 98% or more.
• Employs a wide range of filler metal types in an equally wide
range of electrode diameters.
• Excellent weld bead appearance.
• High operator appeal and ease of use.
• Requires little post weld cleanup.
• Absence of weld spatter.
• Excellent weld fusion.
• Lends itself to semiautomatic, robotic, and hard automation
applications.
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설연휴에도 올리시넹
감사합니다
복마니받으세요
새해를 활기차게 시작하시고, 행복하고 복된 하루하루를 모아 즐거움이 가득한 한해 되시기를 기원합니다. 감사합니다.
미그(MIG)용접은 불활성가스만 사용하고 마그(MAG)용접이 아르곤 + 탄산가스 등 혼합하여 사용하는 것이 아닌가요? 초반에 미그용접의 종류라고 나오네요
좋은 댓글 고맙습니다.
MIG 용접기에 Shield 가스만 바꿔준 것이기에 그렇게 설명드린 것입니다. 감사합니다.
@@plant_kim_CM 네 그렇군요 늘 영상 잘 보고있습니다 즐거운 주말 되세요!
채널에 관심 가져주셔서 고맙습니다. 나눔은 함께 살아가는 세상을 더욱 아름답게 만듭니다. 주변 지인분들과 함께 공유해서 보시면 더욱 좋습니다. 감사합니다.
새해 복 많이받으세요
새해를 활기차게 시작하시고, 행복하고 복된 하루하루를 모아 즐거움이 가득한 한해 되시기를 기원합니다. 감사합니다.
O2
20%도사용되지않나요?
좋은 댓글 고맙습니다.
모재의 종류와 두께에 따라서, 최적합의 용착급속의 접합을 위해 다양한 종류의 가스가 사용되고 있습니다.
말씀하신 20% 산소의 보호가소도 마찬가지 압니다. 산소가 첨가되는 이유는, 산소가 첨가될 수록, 표면장력을 항상켜 용입 폭이 좁고 깊은 비드를 형성 하는 경향이 있기때문입니다. 그런 이유로 산소가 미량 첨가된다는 점을 참고 하시기 바랍니다.