Among LSAW pipes, methods such as UOE, RBE, and JCOE are used, with JCOE noted for its simple production process, high efficiency, and cost-effectiveness. The JCOE method involves a series of steps including bending, jointing, internal welding, external welding, straightening, and flattening, ensuring that the final product adheres to stringent standards. Both the inner and outer surfaces of the steel pipe must be smooth and free from significant defects like folds, cracks, delamination, lap welding, arc breakage, or burn-through, with permissible local defects only if they do not exceed the minimum wall thickness deviation.