Large Current Workpiece Stationary LHA Series H Beam Welding Machine

A. Wide Use of LHA Gantry Frame H I Beam Welding Machine:

1. As the medium station in machine group on welding H Beam Production, LHA series Gantry Frame I H Beam SAW Equipment can be seen everywhere, across all facilities of steel structure industry, delivering superior quality welding H Beam of different sizes:

1) Design sketch on LHAZ model middle operation machines: (Fig.1)

2) Design sketch on LHAC model lateral operation models: (Fig.2)

3) Wuxi JACK LHA4Z model center operation of 4,000mm rail span, delivers 1,200mm web heigh H Beam: (Fig.3)

2. The Perfect Choice on Welding Large H Beam with Gantry Frame I H Beam SAW Welding Machine:

1) LHA series gantry frame machine is only proper solution on welding large H Beam. Here “large” refers to thick plate of H Beam, with 40mm to 80mm thickness. This is benefitting from:

a) 45° fillet position of H Beam;

b) Large welding current in SAW;

c) 3 options of: Single Arc (Single wire), Twin Arc (Double wires single arc), Tandem Arc (Double wires double arc);

2) Performance: The SAW welding on large H Beam can get superior welding seam of: Long length/ Full penetration, and broad cover face:

3) Large H Beam in 45° position on supporting racks and welding torch, in Wuxi JACK LHA5C model machine: (Fig.4)

B. Deployment of Main Function Cells in LHA Series I H Beam Gantry Welding Machine:

Manipulation on all function units is realized under the precondition of, these components are deployed at different specific sections inside the machine:

1. SAW power supplies are put on the workshop floor alongside the long parallel rails, in stationary manner:

2 sets of Chinese HUAYUAN MZ-1250 SAW power supply equipped with Wuxi JACK LHA model machine: (Fig.5)

2. SAW Welding Assistant Units in LHA Models Gantry Frame I H Beam Submerged Arc Welding Machine:

1) Together with its hoppers, SAW welding flux recovery and recycling units are put on the top side of gantry horizontal beam, and move along together with gantry moving during welding operation;

2) SAW welding wire feeders and welding arc tracing units are assembled with SAW welding torch, composing into a complete set of SAW welding unit, which is fit on the transverse moving carriage of welding torch. And each set of the moving carriage is installed on front face of gantry frame beam:

The arrangement of 2 groups of SAW welding units, at front face of Wuxi JACK LHA5Z model middle operation type: (Fig.6)

C. Model Selection and Combination in LHA Gantry Frame I H Beam Submerged Arc Welding Machine:

There are several models of SAW power supply being applied in H Beam welding:  

1. Single Arc: ZD7-1000 (HUAYUAN) or DC-1000 (Lincoln):

1) This refers to D.C. current of max. 1000A for SAW welding. It can meet the requirement on most majority SAW;

2) For all the LHA models machine produced by our company, under the Single Arc submerged arc welding mode, we use this model welding power supply;

2. Twin Arc: MZE-1250 HUAYUAN or AC-1250 Lincoln in Gantry Frame I H Beam SAW Welding Machine:

1) This refers to A.C. current of max. 1250A. It is seldom used as sole SAW power source;

2) Instead, under Twin Arc SAW mode, it works together with DC-1000 or ZD7-1000 SAW power supply. Which means, one set of DC-1000 and AC-1250 each for Lincoln, or one set of ZD7-1600 and MZE-1250 each for HUAYUAN, to be used in combination;

3. HUAYUAN ZD7-1250 or Lincoln DC-1500:

This refers to D.C. current of max. 1250A for HUANYUAN, and 1500A for Lincoln. Both the models have too large current, which is not applicable for working as SAW power source on H Beam welding;

4. Difference between D.C. and A.C. SAW Power Source in I H Beam Gantry Welding Machine:

1) D.C. welding power source features in delivering welding seam of deeper crater and deposition;

2) A.C. welding power source features in delivering welding seam of wider weld fusion and comparative good appearance;

3) For Wuxi JACK LHA model machine on H Beam welding, the SAW power source is one set of Lincoln DC1000 (or HUAYUAN ZD7-1000) for Single Arc, and, as mentioned in the previous segment, one set of Lincoln DC1000 together with one set of Lincoln AC1250 (or one set of HUAYUAN ZD7-1600 together with MZE 1250 each) for Twin Arc.

D. Model of Welding Power Source Consoles in LHA Gantry Frame I H Beam SAW Welding Machine:

1. For HUAYUAN brand welding power source, there is no independent model for the control console. It shares the same model with the power source:

Control console of HUAYUAN welding power supply equipped with LHA model machine: (Fig.7)

2. Lincoln Brand Welding Power Supply in LHA I H Beam Gantry Welding Machine:

For Lincoln brand welding power source, the mating console used in LHA series of machine is:

1) NA-3 for DC1000 model SAW power supply;

2) NA-4 for AC1250 model SAW power supply;

3) NA-5 is the version of state-of-art digital control (Welding parameters pre-set and in real time display);

4) Lincoln SAW welding wire feeder also has the model of NA-3. Need to take care no confusion between control console and welding wire feeder.

E.  Operation on LHA Series Gantry Frame I H Beam SAW Equipment:

1. Prepare on SAW Welding in I H Beam Gantry Welding Machine:

1) After assembled and spot welded in Z15/Z18/Z20 Assembly and Tack Welding Machine, the H Beam is sent and put onto supporting racks of LHA models machine, in the position of 45° fillet welding, the most ideal orientation of workpiece for getting deep penetration and large cover face welding effect;

2) The supporting racks are put and fixed on the workshop floor beneath the gantry:

3) Layout of H Beam, support rack, SAW welding torch mechanism: (Fig.8)

2. SAW Welding in Gantry Frame I H Beam SAW Welding Machine:

1) Welding Torch Position Adjustment: In the process of SAW welding, the two pieces of carriages which are fit with two sets of SAW welding torch can move leftward and rightward along transverse beam of moving gantry, as well as up and down along the two pieces of vertical arms, which are installed on the transverse beam of gantry;

2) In this way, during work, the two sets of welding torches can move along three directions of horizontal / vertical / lateral, making its welding tip aiming at welding seams all along. The forward and backward movement of welding torches in horizontal plane is realized with gantry moving along the rails:

3) Front view on Wuxi JACK LHA5Z model middle operation machine, and its pieces of H Beam: (Fig.9)

3. Welding Seam Tracker: In one set of LHA model I H Beam Gantry Welding Machine, there are two sets of automatic welding seam tracing unit, which are installed at the front end of welding carriages, one tracing unit in one carriage each:

Welding seam tracker equipped in Wuxi JACK LHA models machines: (Fig.10)

4. For implementing on SAW on H Beam, gantry moves along parallel rails in adjustable working speed;

5. The LHAC series machine is also equipped with automatic welding flux deposition and recovery unit: (Fig.11)

F. Technical Parameters of LHA H Beam Gantry Welding Machine:

1. Dimension of finished H Beam: (Fig.12)

2.  Machine Welding Units Configuration:

Parameter	Specification	Note
Submerged Arc Welding type	45° fillet welding, Single Arc, Or Twin Arc
Welding Power Source brand	Chinese HUAYUAN or U.S.A Lincoln	ZD7-1000(ZD7-1600 for Twin Arc) or DC-1000 (A.C.:   AC1250 or MZE 1250)
Welding Power Source quantity	2 sets in the case of Single Arc, And 4 sets in the case of Twin Arc	Machine quotation is different as in the case of Single Arc and Twin Arc
Console of welding power source	NA-3 for Lincoln ZD-7 for HUAYUAN