Shandong Lanjing Building & Construction Co., Ltd.

All of our Lanjing steel structure are ISO 9001-2015 certified. Any third-party inspection will be accepted, such as SGS, BV, TUV etc. We also welcome OEM and ODM orders. So far, we have exported to more than 1,500 projects over 130 countries and regions around the world and accumulated rich experience in the design, fabrication and supply of steel buildings, as well as the erection of steel buildings, architectural materials, electrical systems .You can talk to our customer service center about your sourcing requirements.

PROCEDURE-SUBMERGED ARC WELDING

The production supervisor shall plan the jobs to be welded.

Only the items that are fitted and accepted by QC shall be taken for welding.

Clean the location where the welding has to be done free of dust, oil, grease etc.

Set the wire feed and voltage for welding.

The fillet size shall not exceed more than the smaller thickness of the part unless otherwise specified in the drawing.

The fillet size parameters will be maintained according to the chart displayed in the welding area which is prepared based on GB50661-2011 standard

After welding, remove the spatters and slag completely.

Grind off the burrs, sharp edges and excessive reinforcements.

Offer to QC for inspection.

PROCEDURE-MIG WELDING

The production supervisor shall plan the jobs to be welded.

Only the items that are fitted and accepted by QC shall be taken for welding.

Clean the location where the welding has to be done free of dust, oil, grease etc.

Set the wire feed and voltage for welding.

The fillet size shall not exceed more than the smaller thickness of the part unless otherwise specified in the drawing.

The fillet size parameters will be maintained according to the chart displayed in the welding area which is prepared based on GB50661-2011 standard

After welding, remove the spatters and slag completely.

Grind off the burrs, sharp edges and excessive reinforcements.

Offer to QC for inspection.

HANDLING & PREPARATION OF MATERIAL PRIOR TO BLASTING

Prior to any work commencing, Tool Box Talk shall be performed by Foreman for every task involved in the automated blasting and manual blasting phase. The working area shall be barricaded with information notices posted to alert passersby of the operation within.

The ID of fabricated steel to be blasted shall be recorded by Foreman on a shift to shift basis for the purposes of traceability.

Raw material steel sections to be blasted shall be craned onto the "in-feed" rack. The "in-feed" rack shall be custom built and level with the rollers of the conveyor. All rigging shall be planned before the list of items. All personnel involved shall be suitable trained and qualified for the job they are doing.

Once the raw material is sat on the "in-feed" rack, it may be cleaned with high pressure air to remove dust in the surface of the item.

Quality Standard & Control:

With 20 year warranty in the steel building industry,our company has standard on the quality of steel building. We have acquired the ISO9001 and CE certificate. The followings are the related standard that we strictly follow whether for the design and fabrication of steel buildings:

GB/T1591-2008/2018

GB/T11263-2010

GB/T 2518-2008

GB/T12754-2006

GB/T 1228-2006

Here we take an example on the Process, fabrication and quality control standard on fillet weld size.

1. Purpose

To ensure the quality of fillet weld, meeting up the technical requirements of welded members and improve the standardization of our fabrication, we specially formulate this regulation.

2. Application scope

This manual is applying for the design, fabricate and inspection for the fillet weld size.

3. Fillet weld leg size:

3.1. Definition of fillet weld leg size(K):

Length of catheti from maximum isosceles triangle that drawn from the section of fillet welding seam.

For the fillet weld leg size without groove, please see illustration 1;

For the fillet weld leg size with PJP or CJP groove, please see illustration 2(take CJP for example)

3.2. Fillet weld leg size requirements:

3.2.1. All the fillet weld size should not be less than the drawing and design values.

3.2.2. Minimum fillet weld size K≥1.5×,

t--thickness of thicker welding member(We could adopt the thickness of the thinner welding members when it is welded by low-hydrogen alkaline electrode). The minimum fillet weld size could be reduced by 1mm when it is adopted by sub-merged arch welding;

The fillet weld size should be in increased by 1mm when it is applying to the single side fillet weld of T section.

When the thickness t≤4mm, the minimum fillet weld size should be same with the member thickness.

3.2.3. Maximum fillet weld size K≤1.2t

t--thickness of thinner welding members(except the steel tube structure)

3.2.4. When the fillet weld being on the edge of welding members(t), the fillet weld size cannot exceed the edge of the welding member and the maximum weld size is as followings:

1)when t≤6mm,K≤t;

2)when t>6mm,K≤t-(1~2)mm

3.2.5. For fillet weld size in circular holes or trench holes, K≤(1/3)d

d--diameter of circular hole or short diameter of trench hole

3.2.6. For the fillet weld size without groove, it should not be more than 17mm. If it has to be more than 17mm due to the load consideration, out of economical factor, it should be changed to CJP or PJP fillet welding.

3.2.7. For the fillet weld that requires CJP:K≥t/4, see photos of 3(a)(b)(c). For the fillet weld size between web plate and top flange plate from some important members(e.g.if there is fatigue design requirement), crane beam or similar members, it could be t/2 and cannot more than 10mm meanwhile.

Based on the standard and our experience and actual process, the requirements on the fillet weld size should be as followings(in terms of when there is no request on drawing but there is inspection request):

Lanjing is equipped with a well-trained management team, design team, and quality inspection team whose job is to provide customers within the shortest time, Your project will be in the great hands of our team members. Our credits are contributed to the impeccable arrangement of your order, strictly control the quality of mass production, and guaranteed delivery time.

We have successfully obtained internationally recognized certifications such as CE and ISO 9001, which demonstrate our commitment to quality and adherence to rigorous standards. These certifications validate our comprehensive quality management system and assure our customers that our steel structures meet the highest industry standards. Through the implementation of these certifications, we ensure that our manufacturing processes, materials, and final products undergo rigorous inspection and stick to strict quality control procedures. This allows us to consistently deliver steel structures of exceptional quality and reliability, instilling confidence in our clients and reinforcing our position as a trusted and reputable solution provider in the industry.