It's what beet of doom says. You need to shield your weld or it won't have any strength. If your shield gas runs out while you are welding you notice it immediately .Once the air hits the melted puddled steel you get a lot of air bubbles that mix into the weld and it looks like a porous lava mass instead of a weld
Usually MIG welders or TIG have shield gases. Right where the wire comes out of your welding handle the gas comes out of the little metal cup surrounding your torch handle where the wire exits for the weld. Without that shield gas it is impossible to get a weld
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