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Updated: 12 hours 51 min ago

Introduction to monitoring and control of welding process

Fri, 06/23/2017 - 01:57
Substantial progress has been made in both the determination of control parameters, monitoring techniques and automatic process control.Principles of process control

In any manufacturing process it is necessary to ensure that the outcome of the operations carried out matches some defined objective. This involves controlling the operation of the process in some wayIn order to achieve the desired output it is necessary to:
  • Establish control relationships which enable the effect of the control variables on the process performance to be predicted.

  • Monitor the process to ensure that it is operating within limits defined by the control relationships.

  • Compared with other manufacturing processes, welding has established a reputation for being more difficult to control and less likely to achieve consistent quality.

  • This is probably a result of the multiplicity of interrelated control parameters, the complexity of the control relationships and the difficulty of monitoring process performance.

  • It is also difficult to assess weld integrity without careful non-destructive examination and mechanical properties cannot be checked without destructive testing of the fabrication.
  • These difficulties are recognized in international quality standards and welding is classified as a special process in ISO 9000 and the control measures required for welded fabrication are detailed in ISO 3834.

Comparison of control variables for automatic plasma and MMA weldingAn indication of the number of control parameters which need to be considered for two contrasting arc welding processes is given in Table below.The traditional manual control techniques will be outlined in this chapter and the influence of developments in processes and equipment will be discussed. Substantial progress has also been made in both the determination of control parameters, monitoring techniques and automatic process control.
(Source: )

Mori Seiki SL15M/MC - problem with C axis

Wed, 06/21/2017 - 10:00
Hi everyone,

i have one specific problem with C axis, but i dont have any problem with X and Z axisis.

When i want to take manualy referent Zero, my machine start spinning main spindle and doesnt want to find a Zero point. It just keep going around.

But that is not everything, when i put some program like this:
N70 M45(Start of C axis)
N80 G28 U0
N90 G28 H0
N100 G97 S200 M13
Machine goes in U0, but C axis start to spining when block G28 H0, and doest want to find Zero point?

As you can see in pictures, distance to for C axis is -50000mm, then he comes to 0 and then start form the beggining.

If someone can help me,
I would appreciate it.

Thank you

from the beginning Attached Images

Trumpf trumatic 240 no rotation problems.

Wed, 06/21/2017 - 07:50
Quote: Originally Posted by aleksandr dear sirs,
i have punching machine trumatic 240, no rotation. There is several problems with that. Time to time machine does not work, because cn-fault 2670. Sometimes need to switch of and on several times and the machine can start.
But there is another problems also. The machine can keep tools inside or doesn`t change it time to time. If someone can help me with this, please dont hesitate to reply)
on the pictures you can see the lastest bugs. the problem have solved ;). Thanks to all.

My new mother still keeps the Nike Air of shoes thus far

Tue, 06/20/2017 - 22:52
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Tue, 06/20/2017 - 21:59
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Tue, 06/20/2017 - 21:44
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Tue, 06/20/2017 - 21:32
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Tue, 06/20/2017 - 21:19
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Tue, 06/20/2017 - 21:07
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Tue, 06/20/2017 - 20:55
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Tue, 06/20/2017 - 20:31
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hitachi seiki ht 20 fanuc cnc lathe turret trouble

Mon, 06/19/2017 - 11:53
At my fathers shop we have a 1986 hitachi seiki ht 20 fanuc system 3T model F cnc lathe and the turret has stopped responding. I have tried changing the controller to zero home, jog, and handle jog to no avail. I have also tried holding down the 3 keys like some other forum posts have recommended to reset the position among other things which didn't work. I have tried to manually turn the Z and X axis screw, they move but it has not helped. I have also inspected my hydraulic fluid and it still creates enough pressure that it should move. I do not know a lot about the parameters or the electronics and I have tried looking up the old manuals but it's hard to understand them with my little knowledge in that field. If anyone can help to solve this issue that would be greatly appreciated.

CNC machining from China

Sun, 06/18/2017 - 11:26
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MACHINE not working

Sun, 06/18/2017 - 11:21
Hi, you can call back to machine company in China, this is direct way.any more cnc machining parts or cnc machine problem please check this or call me


Sun, 06/18/2017 - 11:10
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My Chinese 6090 CNC router for sell

Fri, 06/16/2017 - 21:02
I have a 6090 cnc router want to sell. 600mm*900mm working area, 2.2kw water cooled spindle, if anyone interested, please send me email Many thanks.