LHA Gantry Type High Quality H Beam Submerged Arc Welding Machine
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LHA Gantry Type High Quality H Beam Submerged Arc Welding Machine


As introduced in product category H Beam submerged arc welding machine, SAW machine are the most important in H Beam production process, which determines quality of H Beam produced to the greatest extent.


For this reason, the SAW power source we outsource for LHA-series automatic I Beam gantry weld machine (I Beam is the same name as H Beam), as well as LHC column type and LHT T type, is of the top notch in industry. With years of testing and validation, we recommend 2 options on SAW power source:

  1) Chinese Brand HUAYUAN ZD7-1000;

  2) U.S. Brand Lincoln DC1000


Of which the Chinese HUAYUAN has very good cost performance. It is stable and consistent in delivering high standard of welding quality, with reasonable equipment price.


Product introduction:

ZD7series inverter multi-function power source can be used for automatic submerged arc welding, electro-slag welding, sticking welding and arc air gouging. It also has good performance on DC single wire welding and strip surfacing. The main circuit of power source is IGBT inverter circuit of high reliability, fast response speed, and good dynamic characteristic. It can compensate automatically on fluctuation of grid voltage, ensuring arc burning steadily, good-shaped welding seam.

Working principle:

  1) ZD7 series inverter multi-function welding machine adopts with inverter main circuit;

  2) Three-phase A.C. power is converted to 20KHz high-frequency D.C. current after being rectified thru three 

      phase rectifiers;

  3) With IGBT inverter, the D.C. current is inverted to A.C. high frequency current;

  4) This A.C. high frequency current is rectified to D.C. current: After experiencing voltage reduction in high 

      frequency transformer, the current is rectified in fast recovery diode;

  5) This D.C. current is filtered through reactor, and controlled by current negative feedback;

  6) Stepless adjustable current which can meet welding requirement is obtained;

  7) Control circuit controls the output current by means of adjusting pulse width of driving signal;

  8) The current negative feedback signal is checked on output wire;

  9) Amplified, this negative feedback signal is input into inverting end of error amplifier by using pulse width 

      adjusting integrated circuit;

  10) By this time, the signal can control the conductive time of IGBT, hence inverter rectifier can get the required 

       external characteristic.


For console of the SAW power source,please check attached picture.


At delivery of LHA large I Beam gantry weld machine, technical documents also include manual book& electric diagram& maintenance & common trouble shooting of the SAW power source.


Below are specifications of this LHA High Quality I Beam Gantry Weld Machine:




H Beam Flange   Width (mm)

200 ~ 800

H Beam Flange   Thickness (mm)

6 ~ 40

Can be special made

H Beam Web   Height (mm)

200   ~ 1200/1500/1800/2000

Varies on models

H Beam Web   Thickness (mm)

6 ~ 32

Can be special made

H Beam Length   (mm)

4000 ~ 15000

Can be special made

Submerged   Arc Welding type

45° fillet welding

Submerged   Arc Welding mode

Single Arc,

Or Tandem Arc

Welding   Power Source brand

Chinese HUAYUAN or

U.S.A Lincoln

ZD7-1000   or


Welding   Power Source quantity

2 sets in the case of Single Arc,

And 4 sets in the case of Tandem Arc

Machine quotation is different as in the case of Single Arc and Tandem Arc



English Language: 15852755799; 
Chinese Language: 13621515089
No. 2, Ouyang Road, Luoshe Town, Wuxi City, Jiangsu Province, China

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