fabrication rule on site

Fabrication Rule on SiteWelding place

Welding executionBasic fabrication rule

Fabrication Rule on Site : Workplace

Arrange place for welding machine close to the units (not to long welding cable)

Arrange power points for Hand machine such Drill machine Grinding machine etc

Prepare a Tool container Prepare workplace table with vice Arrange ladder and working platform Hold your working place CLEAN


Arrangement of the welding machine and Welder PPI


Not like that!!!


Arrangement of the welding cable and Place

Not like that

Fabrication Rule on Site : Tools

Don’t use tools like that

Fabrication Rule on Site : Welding

Welding Rule for Site work

Good welding preparation Good welding current Take off slag after welding Brush the welding layer Control your welding If necessary repair


Welding Rule for Site work - Welding preparation

Grinding the edgesGive space between edgesElectrode diameter=Gap Don’t do like

That


Welding Rule for Site work- Welding current

Correct Current To High Current To low Current

Take your Time to adjust the right welding currentThat safe a lot of Time later

Easy welding Less repair work GOOD WELDING QUALITY



Correct Current

Over head welding less currentTop welding normal currentRise up welding less current

Guide Number: diameter electrode by 40 = welding current



Steel Plate T > 3mm less currentSteel Plate T =8…10mm normal currentSteel Plate T > 10mm more current



1. Root welding - less current2. Fill welding - more current3. Cover welding - normal current


Welding Rule for Site work- Welding electrode

Electrodes must be still dry and in a good condition (not wed and the coating not broken

Basic Electrodes must be heating up by 250 – 350 C for 2 hour(see on the package)

Transport and storage after heating in a electrode heat container


Welding Rule for Site work- Welding electrode

Don’t use electrodes like this

Don’t weld on wet units …..try up before !!!


Welding Rule for Site work- Welding electrode Basic Electrode must be:

Heated by 350C for 1 ~2 HourTransport and storage on the welding place only in Heat Electrode box


Welding Rule for Site work- Welding on siteSimple welding rule

1. Prepare welding layer2. Welding 3. clean up the slag and brush4. Check your welding5. Repair if it necessary immediately

That's safe a lot of time after….. because we check the welding later


Welding preparation According Welding standard ISO 9692


Welding execution


Welding executionBy thick Plates t>25mm the

root and fill welding layer must be grinded


Welding Quality Level Standard ISO 5817

Level D……..for Normal Steel structureLevel C……..for Columns Steel structure with high loadsLevel B………for Crane, Pressure Vessels, high load structure


Welding Quality Level Standard ISO 5817


Welding check on site Welding view check

-Structure from the welding layer-pore-Crater-Over lapping-Missing welding-Connection fault-under cut-surface penetration


Welding check on site-Check of the thickness from the welding layer

You can do with a welding gauge

Or with a self made template

To measure is the thickness ,,a,,


Welding check on siteCheck of the thickness from the welding layerHow you count the thickness if not shown in the

drawingor you check without drawing ?

With the Guide Number 0,8

< t x 0,8 = a10 x 0,8 = 8

10 mm

15 mm

a=8 mm


Welding check on site Dry penetration Test

-To see surface cracks


Welding check on site Ultra Sonic Test

-To see cracks inside and around the welding layer


Welding and Fabrication mistake

Wrong Preparation



Under cut



Connection mistake



Pore



Wrong Preparation and missing welding



Wrong Preparation



Wrong Preparation

To low Current



Wrong Welding

To low Current


Avoid Welding and Fabrication mistake

Do it slowly

To low Current

Then you are fast!!!

Do it correct


Do Manmanlaiand

Meiyou Mamahuhu

To low Current

fabrication rule on site

Documents