Reddit reviews US Forge Welding Stainless Steel MIG Wire .030 2-Pound Spool #00676
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Country of Origin:ChinaPackage length:4.0"Package width:4.0"Package height:1.75"
Most hypodermic needles are made from stainless steel. Clearly this material cannot be used for TIG welding (melting point of tungsten: 3422°C, while the most heat resistant Stainless Steel alloy can only withstand up to 1530°C.)
For MIG welding, in short: yes. They do make stainless steel MIG wire, however, you would need to ensure that all of your needles (you would need several to make even a measly 2 lb spool) are the same alloy, otherwise this would lead to some... interesting results. Lastly, because stainless is an alloy, it is somewhat more difficult to work with than iron, or carbon steel (yes, steel is an alloy, but it is mostly iron).