Dear all, good articles on welding are being shared. a small clipping to share from my end regards nandish
From United Arab Emirates, Dubai
33From United Arab Emirates, Dubai
Hi,
A very good post on Safety aspects.
HR personnel have to promote safety cosciousness amongst staff & workers.
Exchange of literature, presentations and etc helps HR in giving new/fresh inputs on safety down the line. Just displaying Safety Posters is not sufficient. Revisiting the same topics with fresh inputs is highly effective.
Keep up the exchange and thrust on safety.
Daljit Singh
From Saudi Arabia, Riyadh
A very good post on Safety aspects.
HR personnel have to promote safety cosciousness amongst staff & workers.
Exchange of literature, presentations and etc helps HR in giving new/fresh inputs on safety down the line. Just displaying Safety Posters is not sufficient. Revisiting the same topics with fresh inputs is highly effective.
Keep up the exchange and thrust on safety.
Daljit Singh
From Saudi Arabia, Riyadh
Dear All,
Going through my archives, I found a file comprising various extracts on welding safety. It covers most of what has been covered in this forum but still maybe useful since the sources are varied.
Gopi
From Malaysia, Kuala Lumpur
Going through my archives, I found a file comprising various extracts on welding safety. It covers most of what has been covered in this forum but still maybe useful since the sources are varied.
Gopi
From Malaysia, Kuala Lumpur
@ Gopinathan Pillai
Thanks a lot for your input sir...
@ Dear All
Once again requesting to all, if anyone know the answer to the following questions, come forward please:
1. What should be the minimum and maximum distance from power source and welding machine(Power Cable Length)? Why? I have written in one safety tips it between 3 to 5. But not able to understand the logic.
2. What should be minimum and maximum distance (Length of welding and earth return cable) between welding machine and the piece to be weld?
3. Is there any point in insisting the use of Welding Rectifier instead of welding transformer? Any safety point included or only in view of better quality this coming?
Thanks in advance...
From India
Thanks a lot for your input sir...
@ Dear All
Once again requesting to all, if anyone know the answer to the following questions, come forward please:
1. What should be the minimum and maximum distance from power source and welding machine(Power Cable Length)? Why? I have written in one safety tips it between 3 to 5. But not able to understand the logic.
2. What should be minimum and maximum distance (Length of welding and earth return cable) between welding machine and the piece to be weld?
3. Is there any point in insisting the use of Welding Rectifier instead of welding transformer? Any safety point included or only in view of better quality this coming?
Thanks in advance...
From India
Silly Canadian guys they want people to stop and read from there huge libraries
Welder safety in a pinch before a injury
or
Incident
Welding-helmet, safe practices and welding precautions
AWS Safety & Health Fact Sheets
Welding Fumes: Tips to Minimize Your Risk
MIG Welding Stainless Steel, Safety Issues
Health, safety and environment - Job Knowledge
From Canada, Calgary
Welder safety in a pinch before a injury
or
Incident
Welding-helmet, safe practices and welding precautions
AWS Safety & Health Fact Sheets
Welding Fumes: Tips to Minimize Your Risk
MIG Welding Stainless Steel, Safety Issues
Health, safety and environment - Job Knowledge
From Canada, Calgary
Dear dipil,
First of all sorry for late reply.As per my knowledge and experiance i wrote my answer::::
1. The power supply cable length is determined by engineering values. Cables may be interlinked in series until the impedence or resistance gets too high. First sign will be degradation of the arc and weld, and heating of the cable, particularly at the couplings. However, generally, the power supply cable should be one length (what ever distance) with lugged connections.
2. Same applies for weld cable to piece to be welded as in no. 1 above. Rule of thumb states that you should not interconnect more than five cable lengths (typically one length is 16m.)
3. The weld machine must have internal ground to earth, both for quality and for safety. This is addressed in US by OSHA under assured equipment ground (not be confused with grounding requirements for portable tools and extension cords.)
4.A rectifier converts alternating current to direct current (or vice versa) and adjust phase, a transformer only converts one voltage to another. Rectfiers generally provide better control of the arc and heat, thus resulting in higher quality welds. From a safety stand point, anything that provides better control reduces risk.
One other point to remember - Best Quality practice and Best Safety practice is to connect the welding ground clamp to the piece within 0.5m of the area to be welded. This results in lowest weld resistance, and also controls the current path to ground. This is especially important when welding on mechanical or electrical equipment, as remote connection to ground may allow the current path to arc across bearings, camshafts, drive shafts, gears, circuit boards, etc. Some building fires have also been known to occure due to arcing from structural components (or pipes) that inadvertantly became the path to ground for the welding current.
Hope this helps
Please let me know.....
From United States, Fpo
First of all sorry for late reply.As per my knowledge and experiance i wrote my answer::::
1. The power supply cable length is determined by engineering values. Cables may be interlinked in series until the impedence or resistance gets too high. First sign will be degradation of the arc and weld, and heating of the cable, particularly at the couplings. However, generally, the power supply cable should be one length (what ever distance) with lugged connections.
2. Same applies for weld cable to piece to be welded as in no. 1 above. Rule of thumb states that you should not interconnect more than five cable lengths (typically one length is 16m.)
3. The weld machine must have internal ground to earth, both for quality and for safety. This is addressed in US by OSHA under assured equipment ground (not be confused with grounding requirements for portable tools and extension cords.)
4.A rectifier converts alternating current to direct current (or vice versa) and adjust phase, a transformer only converts one voltage to another. Rectfiers generally provide better control of the arc and heat, thus resulting in higher quality welds. From a safety stand point, anything that provides better control reduces risk.
One other point to remember - Best Quality practice and Best Safety practice is to connect the welding ground clamp to the piece within 0.5m of the area to be welded. This results in lowest weld resistance, and also controls the current path to ground. This is especially important when welding on mechanical or electrical equipment, as remote connection to ground may allow the current path to arc across bearings, camshafts, drive shafts, gears, circuit boards, etc. Some building fires have also been known to occure due to arcing from structural components (or pipes) that inadvertantly became the path to ground for the welding current.
Hope this helps
Please let me know.....
From United States, Fpo
Uppercase share and endeavor... I am trusty a lot member in the marketplace get benefited from this rib... Fastidious instrument ups and presentations... Thanks for sharing...Now retributive distribution a record correlated to welding as my contribution to the draw...
In impose to direct welding equipment, eliminate reliable you are drilled decent. In gain, do not portion righteous anyone to use your welding or division equipment. Hit trustworthy your equipment is put forth at all nowadays when not in use. Unlicensed individuals should never be allowed to use your welding equipment.
Thanks for.....
From India, Ahmadabad
In impose to direct welding equipment, eliminate reliable you are drilled decent. In gain, do not portion righteous anyone to use your welding or division equipment. Hit trustworthy your equipment is put forth at all nowadays when not in use. Unlicensed individuals should never be allowed to use your welding equipment.
Thanks for.....
From India, Ahmadabad
Dear Dipil,
I did discuss with my electrical engineering friend. Combining his point of view and my analysis, i can state as below, with the assumption that this information is more needed to educate the end user as a tool box talk or training without using any jargon.
1.Your question on cable length is pertaining to power than welding cable: (What should be the minimum and maximum distance from power source and welding machine (Power Cable Length)? Why? I have written in one safety tips it between 3 to 5. But not able to understand the logic).
Ideally there is no limit to the length of power source. In factories we connect the machine through bus bar. That means if you can dress the cable properly protecting from damages any length can be used. If the cable is free and prone to damage as it may lie all over the ground / shop floor it is better to restrict the length.
Moreover if the cable length is more and the machine is far away from the source, the welder cannot be able to see the source and control in case of any mishap or incident / accident. Long cable when used cannot be maintained due to pulling and shifting continuously which may damage the insulation resulting to risk for accidents.
In short, if the welding machine is moved frequently, it is better to keep a manageable length of 3 to 5 mts.
2.Second Question - What should be minimum and maximum distance (Length of welding and earth return cable) between welding machine and the piece to be weld?
It is always advisable to use more lengthy power cable than welding cable. Welding cables are costlier (due to copper) when compared to power cable. Also there will be a drop in voltage as the length of welding cable increases.
Generally the earth cable is connected to the welding machine when the weld piece is nearby. Otherwise, they are grounded through the nearest structure (in factory buildings or workshops). Many times we may not be sure that the connected structure is adequately protected and there may be ground failure.
Also it may affect the quality as the welder may set one voltage and complete the job if the machine is far away rather than changing the setting wherever required.
3.Third one - Is there any point in insisting the use of Welding Rectifier instead of welding transformer? Any safety point included or only in view of better quality this coming?
As mentioned by our friends rectifier converts AC to DC whereas transformer is on AC only. In transformers we can get a fixed output for an input. It is like a step transfer. Ex: fan regulator. You can set the speed for 1-2-3-4-5. For seamless transition, rectifier can be used wherein you can have more control from 0 to full. Again take the example of some fan regulators or light intensity regulators wherein it is not a step transition.
On the quality, AC current (transformers) can be used best for metals like mild steel, iron, etc and DC current rectifiers for thin metals or where the weld needs better quality control.
Hope I tried to answer to your questions.
Regards
nandish
From United Arab Emirates, Dubai
I did discuss with my electrical engineering friend. Combining his point of view and my analysis, i can state as below, with the assumption that this information is more needed to educate the end user as a tool box talk or training without using any jargon.
1.Your question on cable length is pertaining to power than welding cable: (What should be the minimum and maximum distance from power source and welding machine (Power Cable Length)? Why? I have written in one safety tips it between 3 to 5. But not able to understand the logic).
Ideally there is no limit to the length of power source. In factories we connect the machine through bus bar. That means if you can dress the cable properly protecting from damages any length can be used. If the cable is free and prone to damage as it may lie all over the ground / shop floor it is better to restrict the length.
Moreover if the cable length is more and the machine is far away from the source, the welder cannot be able to see the source and control in case of any mishap or incident / accident. Long cable when used cannot be maintained due to pulling and shifting continuously which may damage the insulation resulting to risk for accidents.
In short, if the welding machine is moved frequently, it is better to keep a manageable length of 3 to 5 mts.
2.Second Question - What should be minimum and maximum distance (Length of welding and earth return cable) between welding machine and the piece to be weld?
It is always advisable to use more lengthy power cable than welding cable. Welding cables are costlier (due to copper) when compared to power cable. Also there will be a drop in voltage as the length of welding cable increases.
Generally the earth cable is connected to the welding machine when the weld piece is nearby. Otherwise, they are grounded through the nearest structure (in factory buildings or workshops). Many times we may not be sure that the connected structure is adequately protected and there may be ground failure.
Also it may affect the quality as the welder may set one voltage and complete the job if the machine is far away rather than changing the setting wherever required.
3.Third one - Is there any point in insisting the use of Welding Rectifier instead of welding transformer? Any safety point included or only in view of better quality this coming?
As mentioned by our friends rectifier converts AC to DC whereas transformer is on AC only. In transformers we can get a fixed output for an input. It is like a step transfer. Ex: fan regulator. You can set the speed for 1-2-3-4-5. For seamless transition, rectifier can be used wherein you can have more control from 0 to full. Again take the example of some fan regulators or light intensity regulators wherein it is not a step transition.
On the quality, AC current (transformers) can be used best for metals like mild steel, iron, etc and DC current rectifiers for thin metals or where the weld needs better quality control.
Hope I tried to answer to your questions.
Regards
nandish
From United Arab Emirates, Dubai
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