What welding process is not permitted for TC-L1b groove weld details?

The reason GMAW-S (Gas Metal Arc Welding - Short Circuiting Transfer) is not permitted for TC-L1b groove weld details relates to the specific requirements and limitations outlined for that particular type of weld joint. In general, TC-L1b welds are used in applications that require a higher level of control over the welding process to ensure adequate penetration and joint integrity, which may not be achievable with the short circuiting transfer method.

GMAW-S is characterized by its tendency to produce shallow penetration and is better suited for welding thinner materials. For groove weld details, especially those classified as TC-L1b, deeper penetration and a more robust weld are typically necessary. This concern with penetration depth and overall joint strength makes GMAW-S less appropriate for the stringent requirements expected from TC-L1b welds.

In contrast, the other welding processes listed, such as GMAW, SMAW (Shielded Metal Arc Welding), and FCAW (Flux-Cored Arc Welding), offer greater versatility in terms of penetration control and usability across a wider array of materials and thicknesses, aligning better with the performance criteria needed for TC-L1b groove welds. These processes can achieve the necessary weld quality and structural integrity that the TC