EE WAS USING STAINLESS WIRE WHILE WELDING ON MANGANESE LIP ON THE 4100 SHOVEL BUCKET. WEATHER CONDITIONS WERE RAINY AND WINDY. HE HAD AFFIXED A TARP OVERHEAD. WIND MAY HAVE CHANGED DIRECTIONS TO WHERE HE GOT A GOOD WHIFF OF SMOKE. HE FELT LIGHT HEADED AND SOME DISCOMFORT BUT RETURNED TO WORK. FOLLOWING DAY HE CALLED IN SICK BECAUSE OF SMOKE INHALATION.