Teknologi Las Kapal Applying FCAW Flux cored arc

Teknologi Las Kapal Applying FCAW Flux cored arc welding

Introduction v Flux cored arc welding is a process which produces coalescence by means of an arc between a continuous consumable electrode and the work surface. Shielding is provided by flux contained within the tubular electrode. Additional shielding may be obtained from a gas or gas mixture. Teknologi dan Rekayasa

Introduction A flux-cored wire is optimised to obtain performance not possible with a solid wire. A flux-cored wire can do it better and faster for many welding applications like : § vertical-up welding § flat welding § welding over galvanized § welding hard-to-weld steels Teknologi dan Rekayasa

Introduction v The flux in the core stabilised the arc, and contains deoxidisers, scavengers, slag and vapour-forming ingridents. v Gas shielded FCAW electrodes must be supplemented with shielding gas supply (Typically CO 2). v Electrode sizes range from 0. 5 to 4 mm. v FCAW require more electrod extention than GMAW due to the higher current density requirement. If the extention is not sufficient it can create porosity in the weld. v Due to the higher current density deposition rates in FCAW is v higher than GMAW. v The presence of flux and consequential slug provide further protection. FCAW can be used outdoors. v FCAW is suitable for mechanisation and automation. Teknologi dan Rekayasa

Advantages v Continuous and automatic electrode feeding v Can weld a variety of joints v High deposition rates v Deeper penetration than SMAW v High-quality v Less pre-cleaning than GMAW v Slag covering helps with larger out-of -position welds v Self-shielded FCAW is draft tolerant. Teknologi dan Rekayasa

Limitations v Slag must be removed v More smoke and fumes than GMAW and SAW v Spatter v FCAW wire is more expensive v Equipment is more expensive and complex than for SMAW Teknologi dan Rekayasa

FCAW Process Teknologi dan Rekayasa

FCAW Process Teknologi dan Rekayasa

FCAW Electrode Classification E 70 T - 1 Electrode Minimum UTS 70, 000 psi Position Type Gas, Usability and Performance Flux Cored /Tubular Electrode American Welding Society Specification AWS A 5. 20 and AWS A 5. 29. Teknologi dan Rekayasa

FCAW Electrode Classification v E 71 T-1 (FCAW-G): Highest deposition rates out-ofposition. v E 71 T-8 (FCAW-S): Highest deposition rates out-ofposition without a shielding gas. v E 70 T-4 (FCAW-S): Highest deposition rates in the flat position. v E 70 T-1 (FCAW-G): Highest deposition rates in the flat position with Charpy properties. v E 71 T-14 (FCAW-S): Fastest travel speed on galvanized and coated steels. v E 70 T-5 (FCAW-G): Fastest way to weld hard-toweld steels. Teknologi dan Rekayasa

Electrode E 71 T-1 v also offer an exceptionally smooth welding arc and minimal spatter v even with 100% carbon dioxide shielding gas v Argon/carbon dioxide blends are used for the smoothest arc and best out-of-position performance Teknologi dan Rekayasa

Electrode E 71 T-8 v offer the highest deposition rates v in the vertical-up position, 50% faster v since this wire is self-shielded, it is widely used outdoors and in field erection of structural steel Teknologi dan Rekayasa

Electrode E 70 T-4 v in the flat position, the fastest way to join thick steel plate v offers the highest semi-automatic deposition rates v used to join thick steels where there is no Charpy impact toughness requirement v this wire is also selfshielded, allowing it to be easily used outdoors Teknologi dan Rekayasa

SHOW FCAW welding Teknologi dan Rekayasa

Knowledge is the key to success Teknologi dan Rekayasa