Does flux core make strong welds?

As a professional in the field of finance and cryptocurrency, I often encounter questions that are unrelated to my expertise. However, let's simulate a scenario where I'm asked a question about welding techniques. So, in the tone of a questioner, I might inquire: "I've heard a lot about flux core welding, but I'm not entirely sure about its strengths. Could you elaborate on whether flux core welding produces sturdy and reliable welds? I'm particularly interested in knowing if it's suitable for heavy-duty applications where the weld needs to be exceptionally strong and durable. Your insights in this area would be greatly appreciated.