清根    back gouging/ back chipping

焊缝背面    back of weld

封底焊    back sealing weld

逆火    backfire

基值电流    background level

打底焊    backing weld

打底焊道    backing weld (before making main weld)/ back weld

底层焊条    backing welding electrode

焊接衬垫    backing/ welding backing

分段退焊    backstep welding

电极台板    backup die/ bolster

反变形    backward deformation

后倾焊    backward welding(英国)/ backhand welding(美国)

等压式焊炬    balanced pressure torch

对称焊    balanced welding/ balanced welding sequence

镇定变阻器    ballast rheostat

圆棒裂纹试验    bar type cracking test; round bar cracking test

焊条夹吃持端    bare terminal (of an electrode)

母材    base metal; parent metal

基板（基管）    base plate(tube)/ parent plate (tube)

碱性焊条    basic electrode/ lime type covered electrode

巴特尔焊道下裂纹试验    Battelle type underbead cracking test

焊道裂纹    bead crack

电子束电流    beam current

电子束功率    beam power

电子束功率密度    beam power density

台式弧焊机    bench arc welding machine

弯折角    bending angle

坡口切割    beveling; bevel cutting

斜棱滚轮电极    bevelled wheel

开坡口    bevelling (of the edge)/ chanfering

偏压电极    bias electrode

分段多层焊    block sequence/ block welding

沸腾状熔池    boiling molten pool

结合层    bond coating; under coating

粘结焊剂    bonded flux

端部周边焊    boxing/end return

钎缝金属    brace metal

钎焊接头    braced joint; soldered joint

编织焊条    braided electrode

钎焊性    brazability; solderability

钎料膏    braze cream/ braze paste/ solder cream/ solder paste