Huawei CG1-2 Operating Instructions Manual page 17

6．Preheat cutting starting point fully. Put quick knob in the
cutting position and
ascending position. Torch moves upwards. Cutting
oxygen ejects automatically through interlocking between
electromagnetic valve and quadruple switch and cutting
works automatically. (As shown in the diagram2.)
Check cutting state carefully and use speed control device
to control cutting speed. When torch cuts in the middle
part of web plate, the torch should reduce speed slowly (1
to 1.5 graduations in degrees). When torch goes through
surface of web plate, it returns to initial speed. The aim is
to cut web plate in the suitable depth and it is convenient to cut next web plate. The ideal
cutting depth is about 20mm. (as shown in the diagram 3)
7．When tip leaves web plate edge, press quick knob quickly until torch center rises about
300mm over wing plate upper limb. Then put quadruple switch in the off position.
8．Use pointed chipping hammer to clean slag on the web plate.
9．Release clutch and pull machine to go forwards along with the track. Rotate torch 90
degree and keep torch vertical.10 Pull down quadruple switch and tip descends 7 to 10mm
over web plate surface. It is convenient to use quick knob. Tip can not touch web plate.
11. Tip aligns web plate edge, then, close clutch. After preheating cutting starting point fully,
put quadruple switch in the left position and machine starts cutting automatically. Cutting
speed is faster than cutting wing plate. Because web plate is thinner than wing plate. (As
shown in the diagram 4)
put quadruple switch in the
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CG1-2A H Beam cutter