 The equipment is relatively inexpensive and simple , generally employing the combustion of acetylene in oxygen to produce a welding flame temperature of about 3100 ° C. The flame , since it is less concentrated than an electric arc , causes slower weld cooling , which can lead to greater residual stresses and weld distortion , though it eases the welding of high alloy steels . A similar process , generally called oxyfuel cutting , is used to cut metals . 
