I certainly expect that professional artists who design sculptures out of metal have staff who are proficient at their tasks, including welding, brazing, forging and such.
Traditionally an artist who worked in bronze or another metal would be expected to have the highest standards in their craft, since an artwork such as a metal sculpture is costly and usually intended to last for many years of public display. While some modern artists purposely make impermanent works now, the level of technical skill required remains quite high.
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