Make sure you follow the correct procedures when welding. ALWAYS follow the Farm Code 2002. Please read the whole document before attempting to weld. Thanks!
http://img2.aws.org/mwf/attachments//47/185647/farm_code_20081Draft110-Dec-08.pdf2.pdf
http://img2.aws.org/mwf/attachments//47/185647/farm_code_20081Draft110-Dec-08.pdf2.pdf