logo

FAQ

Date:2016-09-22

Oxy-fuel cutting machine
  • 1.The cutting machine suddenly stops walking in work
    • a. Check if the machine fuss is disconnected, if the indicator lamp is ON, it means the fuss works normally;
    • b. Listen if the motor inside the machine runs, if the motor operates normally, and the clutch is closed, maybe the failure comes from the turbine, speed regulating potential device or circuit board;
    • c. If the motor cannot be heard to operate normally, please firstly check if the motor fails.
  • 2. The oxy-fuel cutting machine works normally, but the cutting effect is not ideal.
    • a.Please select the right type cutting tip according to the thickness of the cutting plate and the parameters of cutting tips in the instruction.
    • b.Please adjust the optimal cutting speed according to the actual cutting condition.
  • 3. No torch in cutting ignition
    • a.Please check if the gas circuit is connected correctly and if the two-way valve opens;
    • b.If air pressure and the proportion is set correctly;
    • c.If the cutting tips corresponding to different cutting gases are correct.
  • 4. Causes for flashback of cutting tip
    • a.The cutting tip is too close to the steel plate;
    • b.The cutting tip and the taper of the cutting torch are not matched;
    • c.There is greasy dirt in the air inlet rubber hose, cutting torch or cutting tip.
  • 5. Improper straightness of cutting surface
    • a.Check if the universal wheels are locked and parallel to the machine. We recommend the customer to remove the universal wheel which is far from the cutting torch in cutting operation;
    • b.Check if there is damage or foreign matter on the walking surface of the guide rail and if the walking surface is flat and straight.
  • 6. The cutting surface is not smooth in beveling work
    • a.In beveling cutting, the size of cutting tip shall be bigger than that in vertical cutting of the same plate, and also the torch shall be adjusted to the carbonized torch;
    • b.Check if the guide rail is clean or deformed, and keep the walking track of the cutting machine in work be flat and straight.
  • 7. How to maintain the cutting machine daily?
    • In daily use of the cutting machine, the cutting machine shall be placed carefully. Because of long-time operation of the machine, the lubricating oil can be easily consumed. We recommend replacing the lubricating oil of the gearbox every 6 months so as to reduce gear consumption.
  • 8. How to judge the preheating time of oxy-fuel cutting?
    • Open the preheating oxygen and fuel gas. After ignition, the proper proportion shall be adjusted. When the steel plate is heated to be whitened, the cutting oxygen can be opened for cutting.
  • 9. How to cut when the plate surface is uneven?
    • In this case, we recommend utilizing the special machine model for cutting. The cutting torch of the CG1-30SP cutting machine which has a floatation device can keep the cutting gun and the plate in a fixed distance for the cutting work.
  • 10. How to select the brand of the oxy-fuel cutting machine?
    • All enterprises use accessories of different qualities to produce the machine of the same type. Some enterprises even use low-quality gears, turbines, motors, etc., to reduce the cost. We recommend the brand of Huawei welding and cutting machine. Huawei has more than 20 years of industrial experience, reliable quality guarantee and completed after-sale guarantee, which prove we are your reliable choice.
  • CNC plasma cutting machine
  • 1.General steps of correctly using the CNC cutting machine
    • Firstly, check the relevant operating manuals of torch or plasma power supplies so as to confirm the proper cutting distance between the cutting torch and the plate, and then ensure the normal pressure of the supply gas. In torch cutting, please check if the type of the cutting tip is correct, and next select the proper cutting speed according to plate thickness, and then the cutting work can be carried out.
  • 2. How to set the proper preheating time of oxy-fuel cutting
    • Cut from the edge of the steel plate. The preheating time for piercing shall be decided according to the type of fuel gas, surface quality of steel plate and regulation of heating torch.
  • The following table shows the reference values of the average preheating time
    • Average preheating time (sec
  • Cutting thickness     Acetylene edge and piercing      Propane edge and piercing

    To 20mm                           5    30                                     8     34
    To 50mm                           8    50                                    10    53
    To 100mm                        10    78                                   14    80

    If the high-pressure preheating system is used, about 40% of the above listed data can be reduced. The preheating time can be set in the control system.

  • 3. How to judge if the cutting speed is correct. 
    • The user can observe the surface of the work piece which is cut. Figure 1 shows the overlow cutting speed, figure 2 is the correct speed and figure 3 is over high speed.
  • 4. In plasma cutting, there is a slope on the cutting surface.
    • The plasma arc is not a straight line but in a salix leaf shape. The cutting quality depends on the position of the cutting section of the plasma arc in cutting the steel plate. A large cutting slope will be caused if it is too high or too low. Also, the plate itself is also uneven sometimes, thus, there must be a voltage height regulation device to control the height of the cutting torch at real time so as to guarantee the steel plate and the plasma arc to be always on the optimal cutting position.
  • 5. Format of cutting documents for operating the CNC cutting machine
    • The format of the cutting documents used for our CNC cutting machine is TXT. If the user wants to use the format of DWG or DXF, it can be converted by the programming kit software delivered with the machine. The modified software has the functions of automatic discharge and improving the utilization ratio of materials.
  • 6. Failure of USB linkage
    • Firstly, confirm if the format of the U disk is FAT. If USB can normally operate on the computer, please check if the wire connection of the USB inserting slot of the CNC cutting machine is loosened or if the pin is normal. If everything is OK, it means the latest U disk and the CNC system of the former version are not matched, the U disk is recommended to be replaced for transmitting documents.
  • 7. When the fastCam software is used for material matching, automatic material matching cannot be carried out.
    • When this happens, please check the version of the current software, the software of the common version cannot carry out automatic material matching. We recommend the user to contact Huawei customer service to update the software to the expert version.
  • 8. How to correctly set the voltage, arc delay and positioning delay of the height regulating device?
    • Thanks to every customer who choose Huawei welding and cutting products, when we operate the CNC plasma cutting machine, the voltage, arc delay and positioning delay of the height regulating device shall be correctly set. The voltage decides the distance between the steel plate and the plasma torch. The distance increases with the voltage degree,and vice versa. The arc delay decides the time of perforation, more arc time is required if the thickness of the steel plate is thicker, and vice versa. Positioning delay decides the distance of reverse withdrawal when the plasma torch touches the steel plate, the distance increases if the time is longer, and vice versa. The digital user can refer to the operation manual of the brand of the corresponding plasma power supply.
  • 8. How to correctly set the voltage, arc delay and positioning delay of the height regulating device?
    • Thanks to every customer who choose Huawei welding and cutting products, when we operate the CNC plasma cutting machine, the voltage, arc delay and positioning delay of the height regulating device shall be correctly set. The voltage decides the distance between the steel plate and the plasma torch. The distance increases with the voltage degree,and vice versa. The arc delay decides the time of perforation, more arc time is required if the thickness of the steel plate is thicker, and vice versa. Positioning delay decides the distance of reverse withdrawal when the plasma torch touches the steel plate, the distance increases if the time is longer, and vice versa. The digital user can refer to the operation manual of the brand of the corresponding plasma power supply.
  • Welding carriage
  • 1.How to do daily maintenance of the welding carriage?
    • Periodically clean the nozzle and check if the welding tip is damaged. At the same time, splashed substances on the roller and the carriage shall be cleaned, and also, check if the guide roller can rotate fluently.
  • 2. Easy-damaged spare parts recommended for welding carriage
    • Fuss, rubber roller, guide roller, automatic stop switch, print circuit board.
  • 3. Space switch is invalid, welding operation cannot be stopped.
    • Notice: before check parts among all terminals with check instruments, make sure the power supply is turned off, because short circuit or electric shock will be caused if operate in electrification. Check if terminals of the space switch are conducted. If yes, the sounds of KATA will appear if the switch is pressed down. If the switch is not invalid, it is the failure of the circuit board.
  • 4. The welding carriage doesn’t running in electrification
    • Possible causes for the failure: speed control is zero, and the fuss is molten off. Failure of start switch or failure of print circuit board, space switch is pressed down, or motor circuit is disconnected or damaged.
  • 5. Running speed of the welding carriage cannot be changed
    • Check if the variable resistor for speed control fails or is disconnected, and check if the motor and the print circuit board work normally.
  • 6. Absorbing force of the magnet cannot be weakened (even the handle is inclined) (some models don’t have the magnetic force switch handle).
    • The failure may be caused by the damage or breakage of the rotary shaft pin of the handle, and the shaft pin shall be replaced.
  • 7. Huawei welding carriage can be applied to which welding machines and signal adapters?
    • Huawei welding and cutting carriage can be applied to any welding machine of gas protecting welding type, among these, the HK-5W, HK-6W,HK-100, HK-100S and HK-100K can be directly connected with signal wires of Panasonic welding machine, and current and voltage can be directly regulated on the welding carriage.
  • 8. How to confirm the extension length of the electrode?
    • When the electrode is overlong, bubbles can easily generate in the bath, the arc striking is not good, the electric arc is unstable and the depth of fusion is over shallow. When the electrode is too short, the nozzle can be easily blocked by splashing substances. The operator cannot see the welding wire clearly, and the depth of fusion is over deep. Generally to the fine stick CO2 gas protection welding, the extension length of the electrode is 8 to 14 mm, as well as 10 to 20mm of the thick stick CO2 gas protection welding. The extension length scopes of typical extension lengths of the electrode are shown by the following table.
  •  

     

    Diameter of electrode (mm)

    Extension length of electrode (mm)

     

     

     

    CO2

    Ar+CO2

     

    0.8

    6~12

    12~16

     

    1.0

    8~15

    15~20

     

    1.2

    10~18

    18~24

     

    1.6

    16~24

    24~32

  • 9. How to select the welding carriages of different specifications?
    • Firstly, select the corresponding welding types based on different work pieces, such as flat groove weld, flat fillet weld, vertical weld or suction side welding, etc. Huawei Welding and Cutting can provide the welding carriages of different models corresponding to different welding conditions, and then if guide rail is required for assistance in the walking process is confirmed. At the same time, according to the welding seam, if there shall be a rotary head is confirmed. The models of the welding carriages are various, we recommend the user to consult the sales consults of Huawei Welding and Cutting.
  • 10. Typical causes for defects of flat groove weld and flat fillet weld
    • Main causes for flagging welding seam
    • a. Welding current is too high
    • b. Striking voltage is too low
    • c. Welding speed is too slow
    • d. Incorrect aiming position of welding gun
  • Welding undercut and welding overlap
    • a. Temperature of base material is too high
    • b. Welding speed is too fast
    • c. Striking voltage is too high
    • d. Incorrect aiming position of welding gun
    • e. Arc length is too long, Striking voltage is too high
Beveling machine
  • 1.General terms of beveling machine
    • Bevel significance: the bevel can guarantee more welding liquid to be filled in the welding seam so as to make the welding be firmer.
      Beveling speed: walking speed of the beveling machine.
      Bevel angle: a is bevel angle.
      Bevel depth: d is bevel depth.
      Slope width: w is slope width.
      Feeding depth: F is feeding depth of main shaft.
      Clamping plate thickness: H is clamping plate thickness.
      Clamping plate width: W is clamping plate width.
  • 2. How to install the pipe end preparing machine (End Prep Beveling machine)?
    • Firstly, measure the inner diameter of the processed pipe, and then select the required model to be fixed on the pipe end preparing mechanism according to the figure of pipe ends; then select the proper cutter to be fixed on the cutter head according to the figure of cutters, please pay attention that the blade direction shall be same as the rotating direction of the machine; return the stroke of the feeding hand wheel to make there is enough feeding space of the cutter and the pipeline port; insert the pipe end preparing mechanism into the pipe, slightly tighten the nut of the pulling rod, and then try to forward, backward, leftward and rightward swing the machine so as to make the expanding mechanism be correctly fixed at the pipe center by itself; tighten the nut of the pulling rod, and confirm the machine is fixed; and at last, connect with the power supply to work.
  • 3. How to correctly operate the pipe beveling machine?
    • When cut carbon steel and alloy steel, special cooling oil or cooling liquid shall be used for cooling so as to improve the service life of the cutter and reduce abrasion. Water or corrosive liquid is forbidden to be used for cooling. The force of the feeding hand wheel shall be uniform. When processing ends, rapidly and reversely rotate the hand wheel to make the cutter head quit. When the cutter is blunt, it shall be timely replaced or sharpened.
  • 4. Cutter head of electric beveling machine doesn’t rotate
    • Firstly check if the power supply, the power supply wire or the switch normally operates, and then check the length and elasticity of the carbon brush of the motor, if the carbon brush is severely damaged, replace it with a new one. If all of the above parts are normal, then it must be the failure of the motor which shall be repaired or replaced.
  • 5.Differences of edge milling machine and steel plate beveling machine
    • Contrast to the steel plate beveling machine, the edge milling machine has lower processing efficiency, but in the slope work of which the slope width is higher than 30mm, the processing speed of the edge milling machine will be higher than that of the steel plate beveling machine. The slope fineness of the steel plate processed by the edge milling machine is higher, and the steel plate can be directly painted on its external surface to be the finished product for delivery.
  • 5.Differences of edge milling machine and steel plate beveling machine
    • Contrast to the steel plate beveling machine, the edge milling machine has lower processing efficiency, but in the slope work of which the slope width is higher than 30mm, the processing speed of the edge milling machine will be higher than that of the steel plate beveling machine. The slope fineness of the steel plate processed by the edge milling machine is higher, and the steel plate can be directly painted on its external surface to be the finished product for delivery.


Electrode Oven

 

General failures and remedies of electrode oven

No.

Failure

Causes of failure

Remedies

1

The incubator cannot be heat.

1

The thermal insulation indicator green lamp is ON, but the incubator indicator red lamp is OFF, the 120 DEG C thermal relay is not communicated.

Replace the 120 DEG C thermal relay.

2

All of the indicator lamps are OFF, and the incubator doesn’t heat.

Wherein there is the short circuit in the bead wire or at the output terminal of the transformer.

2

The AC contactor cannot be successfully picked up.

1

The temperature control instrument is always low and cannot be communicated, the 10 to 11 terminals of the time relay are not communicated, and the 2 to 3 terminals of the JTX-3C relay are not communicated.

Check and replace the appliance element.

2

5A fusion chip is loosened and in bad contact.

Tighten the upper cover of the fuse or replace the fusion chip.

3

The startup button doesn’t react after being pressed.

 

The stop button is not communicated, and 10 to 11 terminals of the time relay are not communicated.

Check and replace the stop button or the time replay.

4

The AC contactor sucks together but the ammeter doesn’t indicate.

1

The ammeter doesn’t work.

Measure and replace the ammeter.

2

The fusion chip of the main control fuse doesn’t work.

Measure and replace the fusion chip.

5

At the setting temperature, the time relay doesn’t indicate.

1

The temperature control instrument is always high and cannot be communicated.

Replace the temperature control instrument.

6

Trip occurs in startup.

1

The null line and the ground line are connected in a reverse way.

Check and replace the wiring position.

2

Heating elements are in short circuit.

Check and repair the short circuit.

7

The temperature control instrument displays the number of 1.

 

Thermal couple is in circuit breakage.

Replace the K couple.





Electrode dryer

General failures and remedies of dryer

No.

Failure

Causes for failure

Remedies

1

The dryer doesn’t heat.

1

The red lamp is ON, the green lamp is OFF and the thermal relay is not communicated.

Replace the thermal relay.

2

The red and green lamps are ON but it cannot heat, it is the circuit breakage of the heating element.

Connect the heating element again.

3

The red and green lamps are OFF and cannot heat, the diode is not communicated.

Replace the diode.

2

New product, the rotary knob always smokes.

 

This happens when the resistor on the relay begins to heat at the early heating times.

It is the normal condition.

3

The heating of the dryer is long and slow.

 

The load of the secondary power supply of the welding machine is high or always in the welding status, which causes overlow voltage.

Replace the power supply.

4

After not used for months, the dryer cannot heat when it is used again.

 

The node of the heating element is oxidized and corroded.

Connect again.

5

Bottom ring of the inner dryer looses welding and is disconnected

 

It is caused by the electrode is vertically put into and directly falls into the dryer bottom.

The dryer must be inclined at 45 to 60 DEG and then put into the electrode.




© Copyright: Shanghai Huawei Welding & Cutting Machine Co., Ltd.. All rights reserved.
top Inquiry

If you have any questions, please send an e-mail inquiry