橫梁行軌道焊接-中英對照

與運主橫梁行軌道焊接：
運行軌道的材料為碳鋼Fe70－2。

焊接件應用夾具或點焊安全定位。

使用點焊時，應正確支撐焊接件，直到焊接區(qū)冷卻為止。點焊應從接頭部位直到焊根焊透。在進行第一層焊接時，就融化點焊，使其成為焊縫的一部分。焊接前應將有裂縫的點焊清除。

缺陷

在堆焊下一層前，應將焊縫表面出現(xiàn)的裂縫或氣孔清除（通過切屑或打磨，使表面為干凈的金屬表面）。下一層的焊接也采用與此相同的過程。焊接應無切根，盡可能無重疊、殘渣及孔隙。

焊接坡口的處理

.雙面對接焊處可進行背焊的地方，直到氣刨清理后焊縫（打磨后用電弧氣刨，將焊接坡口清理干凈）；或者背面切屑，清潔金屬表面后，才能從對側施焊。

清理

在將焊縫焊好后，應將所有的焊渣，藥皮或異物清理干凈。

預熱及溫度控制

焊接前應預熱至50℃（122 ℉）。保持需施焊裂縫和焊接區(qū)干燥很重要。

只能使用干燥過的焊條。不能在雨中焊接。在堆焊前應在整個焊縫長度上使用氣焊焊炬預熱。

預熱至少應在焊點的周圍25 厘米（10 英寸） 的范圍內進行。如果焊縫未完成時停止焊接，則在重新焊接時，焊接處的溫度至少應為50℃（122 ℉）。

熱處理

修補焊接完成后，不必要進行熱處理。

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