横梁行轨道焊接-中英对照
与运主横梁行轨道焊接：
运行轨道的材料为碳钢Fe70－2。
焊接件应用夹具或点焊安全定位。
使用点焊时，应正确支撑焊接件，直到焊接区冷却为止。点焊应从接头部位直到焊根焊透。在进行第一层焊接时，就融化点焊，使其成为焊缝的一部分。焊接前应将有裂缝的点焊清除。
缺陷
在堆焊下一层前，应将焊缝表面出现的裂缝或气孔清除（通过切屑或打磨，使表面为干净的金属表面）。下一层的焊接也采用与此相同的过程。焊接应无切根，尽可能无重叠、残渣及孔隙。
焊接坡口的处理
.双面对接焊处可进行背焊的地方，直到气刨清理后焊缝（打磨后用电弧气刨，将焊接坡口清理干净）；或者背面切屑，清洁金属表面后，才能从对侧施焊。
清理
在将焊缝焊好后，应将所有的焊渣，药皮或异物清理干净。
预热及温度控制
焊接前应预热至50℃（122 ℉）。保持需施焊裂缝和焊接区干燥很重要。
只能使用干燥过的焊条。不能在雨中焊接。在堆焊前应在整个焊缝长度上使用气焊焊炬预热。
预热至少应在焊点的周围25 厘米（10 英寸） 的范围内进行。如果焊缝未完成时停止焊接，则在重新焊接时，焊接处的温度至少应为50℃（122 ℉）。
热处理
修补焊接完成后，不必要进行热处理。
Welding of the run rails to the main cross beam:
The material of run rails is carbon steel Fe70--2.
Parts to be welded shall be held securely in place by the use of clamps or by tackwelding.
When using tackwelds, the partsshall be properly supported against sagging until the welded
area hascooled. Tackweldsshallpenetrate the joint to the welded root. As the initial weld pass
is made, tackwelds shall be melted out and made a part of the welded matrix. Cracked
tackwelds shall be removed before welding.
Defects
Any cracks or blow holes that appear on the surface of any bead of welding shall be removed
by chipping or grinding to a sound clean metal before depositing the next successive bead of
welding. The next successive bead of welding shall be deposited in accordance with this
procedure. The welds shall be free from undercutting and reasonable free of overlap, trapped
slag and porosity.
Treatment of welding groove
Where sound back--welding from the opposite side is possible on double--welded butt joints,
the weld fromthe opposite side shall not be madeuntilthejoint hasbeen backgouged(carbon
arc gouging with subsequent grinding to clean up the welding groove) or back--chipped to
sound clean metal.
Cleaning
All traces of slag, flux or foreign material shall be removed before laying down the successive
welding bead.
Pre--heating and temperature control
Preheating to 50_C (122_F) shall be done prior to any welding. It is essential to dry the cracks
and areas to weld.
Only the dried welding rods are allowable. Welding in the rain is not acceptable.Preheating
shall be done using gas torches and shall be for full length of the weld joint prior to starting the
weld deposit.
Preheat shall be over an area at least 25 cm (10”) all directions from
thepointofweld.Ifweldingprogressisstoppedbeforecompletionof anyjoint, thetemperature
of the weld joint shall be at least 50_C (122_F) before resuming weld operations.
Heat treatment
Heat treatment after repair welding is not necessary.
2014.10.21