ive done hamons i want a very visible line like these blades ? what would be my best way to get these ?The term is "San-Mai". Personally I would recommend against the "taco weld" thing.... it usually ends in failure. A far better choice would be to simply have 3 individual pieces, flat and clean on the mating faces..... it will give you a far better chance of success.
Most folks who are just starting/trying the San-Mai technique, will generally use 1080, 1084, or 1095 for the core, and 15N20 for the exterior layers, simply because that combo is super easy to forge weld.