Quartz welding gun for butt joint of thick pipe wall and flange

The invention relates to the field of product machining, and provides a quartz welding gun for butt joint of a thick pipe wall and a flange. The welding gun comprises a welding gun body and a welding pipe arranged at the output end of the welding gun body, the welding pipe comprises a fold line type gas supply part and a combustion part arranged on the gas supply part, a gas inlet is formed in the gas supply part, the combustion part comprises at least two rows of first fire outlets, the two rows of first fire outlets are arranged in a relatively inclined mode, and the welding pipe is arranged at the output end of the welding gun body. The quartz welding gun provided by the invention is provided with at least two rows of first fire outlets, and the two rows of first fire outlets are oppositely and obliquely arranged, so that during welding, the two rows of first fire outlets are aligned between a flange and a thick pipe wall from two angles to heat the flange and the thick pipe wall at the same time, the oper